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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
After Dark 1.5
Stockholm Spark Meetup
Chris Fregly
Principal Data Solutions Engineer
We’re Hiring - Only Nice People!
Nov 23rd, 2015
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Who Am I?
2

Streaming Data Engineer
Open Source Committer


Data Solutions Engineer

Apache Contributor
Principal Data Solutions Engineer
IBM Technology Center
Founder
Advanced Apache Meetup
Author
Advanced .
Due 2016
My Ma’s First Time in California
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Random Slide: More Ma “First Time” Pics
3
In California
 Using Chopsticks
 Using “New” iPhone
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Upcoming Meetups and Conferences
London Spark Meetup (Oct 12th)
Scotland Data Science Meetup (Oct 13th)
Dublin Spark Meetup (Oct 15th)
Barcelona Spark Meetup (Oct 20th)
Madrid Big Data Meetup (Oct 22nd)
Paris Spark Meetup (Oct 26th)
Amsterdam Spark Summit (Oct 27th)
Brussels Spark Meetup (Oct 30th)
Zurich Big Data Meetup (Nov 2nd)
Geneva Spark Meetup (Nov 5th)
San Francisco Datapalooza (Nov 10th)
San Francisco Advanced Spark (Nov 12th)
4
Oslo Big Data Hadoop Meetup (Nov 19th)
Helsinki Spark Meetup (Nov 20th)
Stockholm Spark Meetup (Nov 23rd)
Copenhagen Spark Meetup (Nov 25th)
Budapest Spark Meetup (Nov 26th)
Istanbul Spark Meetup (Nov 28th)
Singapore Strata Conference (Dec 1st)
Sydney Spark Meetup (Dec 7th)
Melbourne Spark Meetup (Dec 9th)
San Francisco Advanced Spark (Dec 10th)
Toronto Spark Meetup (Dec 14th)
Austin Data Days Conference (Jan 16th)
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Advanced Apache Spark Meetup
Meetup Metrics
1600+ Members in just 4 mos!
Top 5 Most Active Spark Meetup!!

Meetup Goals
  Dig deep into codebase of Spark and related projects
  Study integrations of Cassandra, ElasticSearch,

Tachyon, S3, BlinkDB, Mesos, YARN, Kafka, R
  Surface and share patterns and idioms of these 

well-designed, distributed, big data components
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
All Slides and Code Are Available!

advancedspark.com
slideshare.net/cfregly
github.com/fluxcapacitor
hub.docker.com/r/fluxcapacitor

6
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
What is “ 
 
 
 
 After Dark”?
Spark-based, Advanced Analytics Reference App
End-to-End, Scalable, Real-time Big Data Pipeline
Demo Spark and Related Open Source Projects
7
github.com/fluxcapacitor
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Live, Interactive Demo!
sparkafterdark.com
8
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Audience Participation Needed!!
9
You -> 
 Audience Instructions
  Go to sparkafterdark.com
  Click 3 actresses and 3 actors
  Wait for us to analyze together!




Links To Do This Yourself!
  github.com/fluxcapacitor
  hub.docker.com/r/fluxcapacitor

Data ->
Scientist
EU Safe Harbor Disclaimer

This is Totally Anonymous!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Tools of This Talk
10
  Kafka
  Redis
  Docker
  Ganglia
  Cassandra
  Parquet, JSON, ORC, Avro
  Apache Zeppelin Notebooks
  Spark SQL, DataFrames, Hive
  ElasticSearch, Logstash, Kibana
  Spark ML, GraphX, Stanford CoreNLP
…
github.com/fluxcapacitor
hub.docker.com/r/fluxcapacitor
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Themes of this Talk
 Filter
 Off-Heap 
 Parallelize 
 Approximate
 Find Similarity
 Minimize Seeks
 Maximize Scans
 Customize for Workload
 Tune Performance At Every Layer
11
  Be Nice, Collaborate!
Like my Ma!!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Presentation Outline
 Spark Core: Tuning & Mechanical Sympathy
 Spark SQL: Query Optimizing & Catalyst
12
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Spark Core: Tuning & Mechanical Sympathy
Understand and Acknowledge Mechanical Sympathy

Study AlphaSort and 100TB GraySort Challenge

Dive Deep into Project Tungsten

 13
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Mechanical Sympathy
Hardware and software working together in harmony.

- Martin Thompson

 http://mechanical-sympathy.blogspot.com


Whatever your data structure, my array will beat it.

- Scott Meyers

 Every C++ Book, basically

14
Hair
Sympathy
- Bruce Jenner
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Spark and Mechanical Sympathy
15
Project 

Tungsten
(Spark 1.4-1.6+)
GraySort
Challenge
(Spark 1.1-1.2)
Minimize Memory and GC
Maximize CPU Cache Locality
Saturate Network I/O
Saturate Disk I/O
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
AlphaSort Technique: Sort 100 Bytes Recs
16
Value
Ptr
Key
Dereference Not Required!
AlphaSort

List [(Key, Pointer)]

Key is directly available for comparison
Naïve

List [Pointer]

Must dereference key for comparison
Ptr
Dereference for Key Comparison
Key
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Line and Memory Sympathy
Key (10 bytes)+Pointer (*4 bytes)*Compressed OOPs

= 14 bytes


17
Key
 Ptr
Not CPU Cache-line Friendly!
Ptr
Key-Prefix
2x CPU Cache-line Friendly!
Key-Prefix (4 bytes) + Pointer (4 bytes) 

= 8 bytes
Key (10 bytes)+Pad (2 bytes)+Pointer (4 bytes)

= 16 bytes
 Key
 Ptr
Pad
/Pad
 CPU Cache-line Friendly!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Performance Comparison
18
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Similar Trick: Direct Cache Access (DCA)
Pull out packet header along side pointer to payload
19
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Line Sizes
20
My

Laptop
My

SoftLayer

BareMetal
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Cache Hits: Sequential v Random Access
21
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Mechanical Sympathy
CPU Cache Lines and Matrix Multiplication

22
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Naïve Matrix Multiplication
// Dot product of each row & column vector
for (i <- 0 until numRowA)
for (j <- 0 until numColsB)
for (k <- 0 until numColsA)
res[ i ][ j ] += matA[ i ][ k ] * matB[ k ][ j ];

23
Bad: Row-wise traversal,

 not using CPU cache line,

ineffective pre-fetching
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Friendly Matrix Multiplication


// Transpose B
for (i <- 0 until numRowsB)
for (j <- 0 until numColsB)

matBT[ i ][ j ] = matB[ j ][ i ];


// Modify dot product calculation for B Transpose
for (i <- 0 until numRowsA)
for (j <- 0 until numColsB)
for (k <- 0 until numColsA)
res[ i ][ j ] += matA[ i ][ k ] * matBT[ j ][ k ];
24
Good: Full CPU cache line,

effective prefetching
OLD: res[ i ][ j ] += matA[ i ][ k ] * matB [ k ] [ j ];
Reference j

before k
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Instrumenting and Monitoring CPU
Use Linux perf command!
25
http://www.brendangregg.com/blog/2015-11-06/java-mixed-mode-flame-graphs.html
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Demo!
Compare CPU Naïve & Cache-Friendly Matrix Multiplication
26
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Results of Matrix Multiply Comparison
Cache-Friendly 

Matrix Multiply
27
Naive 

Matrix Multiply
perf stat –event L1-dcache-load-misses,L1-dcache-prefetch-misses,LLC-load-misses, 
LLC-prefetch-misses,cache-misses,stalled-cycles-frontend
~27x
~13x
~13x
~2x
~10x
 550 hp
55 hp
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Mechanical Sympathy
Updating a Tuple of Counters in Thread-safe Manner

28
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Naïve Case Class Counters
case class MyTuple(left: Int, right: Int)

object CacheNaiveCaseClassCounters {
var tuple = new MyTuple(0,0)
…

def increment(leftIncrement: Int, rightIncrement: Int) : MyTuple = {
tuple.synchronized {
tuple = new MyTuple(tuple.left + leftIncrement, 

 
 
 
 
 
 
 
 tuple.right + rightIncrement)
tuple
}
}
}
29
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Naïve Tuple Counters
object CacheNaiveTupleIncrement {
var tuple = (0,0)
…

def increment(leftIncrement: Int, rightIncrement: Int) : (Int, Int) = {
tuple.synchronized {
tuple = (tuple._1 + leftIncrement, tuple._2 + rightIncrement)
tuple
}
}
}
30
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU Cache Friendly Lock-Free Counters
object CacheFriendlyLockFreeCounters {
// a single Long (8-bytes) will maintain 2 separate Ints (4-bytes each)
val tuple = new AtomicLong()
…
def increment(leftIncrement: Int, rightIncrement: Int) : Long = {
var originalLong = 0L
var updatedLong = 0L
do {

originalLong = tuple.get()

val originalRightInt = originalLong.toInt // cast originalLong to Int to get right counter

val originalLeftInt = (originalLong >>> 32).toInt // shift right to get left counter

val updatedRightInt = originalRightInt + rightIncrement // increment right counter

val updatedLeftInt = originalLeftInt + leftIncrement // increment left counter

updatedLong = updatedLeftInt // update the new long with the left counter

updatedLong = updatedLong << 32 // shift the new long left 

updatedLong += updatedRightInt // update the new long with the right counter
} while (tuple.compareAndSet(originalLong, updatedLong) == false)
updatedLong
}
31
Q: Why not @volatile long?
A: JVM (Java Memory Model)

does not guarantee atomic

updates of 64-bit longs, doubles
Lock-free, compare and set
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Demo!
Compare Naïve & Cache-Friendly Tuple Counter Synchronization
32
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Results of Counters Comparison
Naïve Case Class Counters




Naïve Tuple Counters

Cache Friendly,

Lock-Free Counters
~2x
~1.5x
~3.5x
~2x
~2x
~1.5x
~1.5x
~1.5x
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Profiling Visualizations: Flame Graphs
34
Example: Spark Word Count
Java Stack Traces are Good! 
(-XX:-Inline -XX:+PreserveFramePointer)
Plateaus

are Bad!!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
100TB GraySort Challenge
Sort 100TB of 100-Byte Records with 10-byte Keys
Custom Data Structs & Algos for Sort & Shuffle
Saturate Network and Disk I/O Controllers
35
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
100TB GraySort Challenge Results
36
Performance Goals
 Saturate Network I/O
 Saturate Disk I/O
 Maxminize Throughput
(2013) (2014)
EC2 (i2.8xlarge)
(2014)
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Winning Hardware Configuration
Compute

206 Workers, 1 Master (AWS EC2 i2.8xlarge)

32 Intel Xeon CPU E5-2670 @ 2.5 Ghz

244 GB RAM, 8 x 800GB SSD, RAID 0 striping, ext4

3 GBps mixed read/write disk I/O per node
Network

AWS Placement Groups, VPC, Enhanced Networking

Single Root I/O Virtualization (SR-IOV)

10 Gbps, low latency, low jitter (iperf: ~9.5 Gbps)
37
Q: Why only 206? A: Network is saturated @ 206
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Winning Software Configuration
Spark 1.2, OpenJDK 1.7
Disable caching, compression, spec execution, shuffle spill
Force NODE_LOCAL task scheduling for optimal data locality
HDFS 2.4.1 short-circuit local reads, 2x replication
Empirically chose between 4-6 partitions per cpu

206 nodes * 32 cores = 6592 cores 

6592 cores * 4 = 26,368 partitions

6592 cores * 6 = 39,552 partitions

6592 cores * 4.25 = 28,000 partitions (empirical best)
Range partitioning takes advantage of sequential keyspace

Required ~10s of sampling 79 keys from in each partition
38
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
New Sort Shuffle Manager for Spark 1.2
Original “hash-based” 
 
 New “sort-based”







①  Use less OS resources (socket buffers, file descriptors)
②  TimSort partitions in-memory
③  MergeSort partitions on-disk into a single master file
④  Serve partitions from master file: seek once, sequential scan
39
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Asynchronous Network Module
Switch to asyncronous Netty vs. synchronous java.nio
Switch to zero-copy epoll

Use only kernel-space between disk and network controllers
Custom memory management

spark.shuffle.blockTransferService=netty
Spark-Netty Performance Tuning

spark.shuffle.io.preferDirectBuffers=true

 
Reuse off-heap buffers

spark.shuffle.io.numConnectionsPerPeer=8 (for example)

 
Increase to saturate hosts with multiple disks (8x800 SSD)
40
Details in
SPARK-2468
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Custom Algorithms and Data Structures
Optimized for sort & shuffle workloads
o.a.s.util.collection.TimSort[K,V]

Based on JDK 1.7 TimSort

Performs best with partially-sorted runs

Optimized for elements of (K,V) pairs

Sorts impl of SortDataFormat (ie. KVArraySortDataFormat)
o.a.s.util.collection.AppendOnlyMap

Open addressing hash, quadratic probing

Array of [(K, V), (K, V)] 

Good memory locality

Keys never removed, values only append
41
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Daytona GraySort Challenge Goal Success






1.1 Gbps/node network I/O (Reducers)

Theoretical max = 1.25 Gbps for 10 GB ethernet
3 GBps/node disk I/O (Mappers)
42
Aggregate 

Cluster
Network I/O!
220 Gbps / 206 nodes ~= 1.1 Gbps per node
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Shuffle Performance Tuning Tips
Hash Shuffle Manager (Deprecated)

spark.shuffle.consolidateFiles (Mapper)

o.a.s.shuffle.FileShuffleBlockResolver
Intermediate Files

Increase spark.shuffle.file.buffer (Reducer)

Increase spark.reducer.maxSizeInFlight if memory allows
Use Smaller Number of Larger Executors

Minimizes intermediate files and overall shuffle

More opportunity for PROCESS_LOCAL
SQL: BroadcastHashJoin vs. ShuffledHashJoin

spark.sql.autoBroadcastJoinThreshold 


Use DataFrame.explain(true) or EXPLAIN to verify

43
Many Threads
(1 per CPU)
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Project Tungsten
Data Struts & Algos Operate Directly on Byte Arrays
Maximize CPU Cache Locality, Minimize GC
Utilize Dynamic Code Generation
44
SPARK-7076
(Spark 1.4)
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Why is CPU the Bottleneck?
CPU is used for serialization, hashing, compression

GraySort optimizations improved network & shuffle

Network and Disk I/O bandwidth are relatively high

More partitioning, pruning, predicate pushdowns

Better columnar formats reduce disk I/O bottleneck
45
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Yet Another Spark Shuffle Manager!
spark.shuffle.manager =

hash (Deprecated)

 
< 10,000 reducers

 
Output partition file hashes the key of (K,V) pair

 
Mapper creates an output file per partition 

 
Leads to M*P output files for all partitions

sort (GraySort Challenge)

 
> 10,000 reducers

 
Default from Spark 1.2-1.5

 
Mapper creates single output file for all partitions

 
Minimizes OS resources, netty + epoll optimizes network I/O, disk I/O, and memory

 
Uses custom data structures and algorithms for sort-shuffle workload

 
Wins Daytona GraySort Challenge 

tungsten-sort (Project Tungsten)

 
Default since 1.5

 
Modification of existing sort-based shuffle

 
Uses com.misc.Unsafe for self-managed memory and garbage collection

 
Maximize CPU utilization and cache locality with AlphaSort-inspired binary data structures/algorithms

 
Perform joins, sorts, and other operators on both serialized and compressed byte buffers
46
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
CPU & Memory Optimizations
Custom Managed Memory

Reduces GC overhead

Both on and off heap

Exact size calculations
Direct Binary Processing

Operate on serialized/compressed arrays

Kryo can reorder/sort serialized records

LZF can reorder/sort compressed records
More CPU Cache-aware Data Structs & Algorithms

o.a.s.sql.catalyst.expression.UnsafeRow

o.a.s.unsafe.map.BytesToBytesMap
Code Generation (default in 1.5)

Generate source code from overall query plan

100+ UDFs converted to use code generation
47
UnsafeFixedWithAggregationMap
TungstenAggregationIterator
CodeGenerator
GeneratorUnsafeRowJoiner
UnsafeSortDataFormat
UnsafeShuffleSortDataFormat
PackedRecordPointer
UnsafeRow
UnsafeInMemorySorter
UnsafeExternalSorter
UnsafeShuffleWriter
Mostly Same Join Code,
UnsafeProjection
UnsafeShuffleManager
UnsafeShuffleInMemorySorter
UnsafeShuffleExternalSorter
Details in
SPARK-7075
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
sun.misc.Unsafe
48
Info

addressSize()

pageSize()
Objects

allocateInstance()

objectFieldOffset()
Classes

staticFieldOffset()

defineClass()

defineAnonymousClass()

ensureClassInitialized()
Synchronization

monitorEnter()

tryMonitorEnter()

monitorExit()

compareAndSwapInt()

putOrderedInt()
Arrays

arrayBaseOffset()

arrayIndexScale()
Memory

allocateMemory()

copyMemory()

freeMemory()

getAddress() – not guaranteed after GC

getInt()/putInt()

getBoolean()/putBoolean()

getByte()/putByte()

getShort()/putShort()

getLong()/putLong()

getFloat()/putFloat()

getDouble()/putDouble()

getObjectVolatile()/putObjectVolatile()
Used by 

Tungsten
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Spark + com.misc.Unsafe
49
org.apache.spark.sql.execution.
aggregate.SortBasedAggregate
aggregate.TungstenAggregate
aggregate.AggregationIterator
aggregate.udaf
aggregate.utils
SparkPlanner
rowFormatConverters
UnsafeFixedWidthAggregationMap
UnsafeExternalSorter
UnsafeExternalRowSorter
UnsafeKeyValueSorter
UnsafeKVExternalSorter
local.ConvertToUnsafeNode
local.ConvertToSafeNode
local.HashJoinNode
local.ProjectNode
local.LocalNode
local.BinaryHashJoinNode
local.NestedLoopJoinNode
joins.HashJoin
joins.HashSemiJoin
joins.HashedRelation
joins.BroadcastHashJoin
joins.ShuffledHashOuterJoin (not yet converted)
joins.BroadcastHashOuterJoin
joins.BroadcastLeftSemiJoinHash
joins.BroadcastNestedLoopJoin
joins.SortMergeJoin
joins.LeftSemiJoinBNL
joins.SortMergerOuterJoin
Exchange
SparkPlan
UnsafeRowSerializer
SortPrefixUtils
sort
basicOperators
aggregate.SortBasedAggregationIterator
aggregate.TungstenAggregationIterator
datasources.WriterContainer
datasources.json.JacksonParser
datasources.jdbc.JDBCRDD
org.apache.spark.
unsafe.Platform
unsafe.KVIterator
unsafe.array.LongArray
unsafe.array.ByteArrayMethods
unsafe.array.BitSet
unsafe.bitset.BitSetMethods
unsafe.hash.Murmur3_x86_32
unsafe.map.BytesToBytesMap
unsafe.map.HashMapGrowthStrategy
unsafe.memory.TaskMemoryManager
unsafe.memory.ExecutorMemoryManager
unsafe.memory.MemoryLocation
unsafe.memory.UnsafeMemoryAllocator
unsafe.memory.MemoryAllocator (trait/interface)
unsafe.memory.MemoryBlock
unsafe.memory.HeapMemoryAllocator
unsafe.memory.ExecutorMemoryManager
unsafe.sort.RecordComparator
unsafe.sort.PrefixComparator
unsafe.sort.PrefixComparators
unsafe.sort.UnsafeSorterSpillWriter
serializer.DummySerializationInstance
shuffle.unsafe.UnsafeShuffleManager
shuffle.unsafe.UnsafeShuffleSortDataFormat
shuffle.unsafe.SpillInfo
shuffle.unsafe.UnsafeShuffleWriter
shuffle.unsafe.UnsafeShuffleExternalSorter
shuffle.unsafe.PackedRecordPointer
shuffle.ShuffleMemoryManager
util.collection.unsafe.sort.UnsafeSorterSpillMerger
util.collection.unsafe.sort.UnsafeSorterSpillReader
util.collection.unsafe.sort.UnsafeSorterSpillWriter
util.collection.unsafe.sort.UnsafeShuffleInMemorySorter
util.collection.unsafe.sort.UnsafeInMemorySorter
util.collection.unsafe.sort.RecordPointerAndKeyPrefix
util.collection.unsafe.sort.UnsafeSorterIterator
network.shuffle.ExternalShuffleBlockResolver
scheduler.Task
rdd.SqlNewHadoopRDD
executor.Executor
org.apache.spark.sql.catalyst.expressions.
regexpExpressions
BoundAttribute
SortOrder
SpecializedGetters
ExpressionEvalHelper
UnsafeArrayData
UnsafeReaders
UnsafeMapData
Projection
LiteralGeneartor
UnsafeRow
JoinedRow
SpecializedGetters
InputFileName
SpecificMutableRow
codegen.CodeGenerator
codegen.GenerateProjection
codegen.GenerateUnsafeRowJoiner
codegen.GenerateSafeProjection
codegen.GenerateUnsafeProjection
codegen.BufferHolder
codegen.UnsafeRowWriter
codegen.UnsafeArrayWriter
complexTypeCreator
rows
literals
misc
stringExpressions
Over 200 source
files affected!!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Traditional Java Object Row Layout
4-byte String




Multi-field Object


50
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Custom Data Structures for Workload


 UnsafeRow
(Dense Binary Row)


TaskMemoryManager
(Virtual Memory Address)


BytesToBytesMap
(Dense Binary HashMap)
51
Dense, 8-bytes per field (word-aligned)
Key
 Ptr
AlphaSort-Style (Key + Pointer)
OS-Style Memory Paging
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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IBM Spark
UnsafeRow Layout Example
52
Pre-Tungsten




Tungsten
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Custom Memory Management
o.a.s.memory.


TaskMemoryManager & MemoryConsumer

 
Memory management: virtual memory allocation, pageing

 
Off-heap: direct 64-bit address

 
On-heap: 13-bit page num + 27-bit page offset
o.a.s.shuffle.sort.

PackedRecordPointer

 
64-bit word

 
 
(24-bit partition key, (13-bit page num, 27-bit page offset))
o.a.s.unsafe.types.

UTF8String

 
Primitive Array[Byte]
53
2^13 pages * 2^27 page size = 1 TB RAM per Task
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IBM Spark
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
UnsafeFixedWidthAggregationMap
Aggregations
o.a.s.sql.execution.


UnsafeFixedWidthAggregationMap

 
Uses BytesToBytesMap

 
In-place updates of serialized data

 
No object creation on hot-path

 
Improved external agg support

 
No OOM’s for large, single key aggs
o.a.s.sql.catalyst.expression.codegen.

GenerateUnsafeRowJoiner

 
Combine 2 UnsafeRows into 1
o.a.s.sql.execution.aggregate.

TungstenAggregate & TungstenAggregationIterator

 
Operates directly on serialized, binary UnsafeRow

 
2 Steps: hash-based agg (grouping), then sort-based agg

 
Supports spilling and external merge sorting
54
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Equality
Bitwise comparison on UnsafeRow

No need to calculate equals(), hashCode()

Row 1
Equals!
Row 2
55
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Joins
Surprisingly, not many code changes

o.a.s.sql.catalyst.expressions.

UnsafeProjection

 
Converts InternalRow to UnsafeRow
56
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Sorting
o.a.s.util.collection.unsafe.sort. 


UnsafeSortDataFormat

UnsafeInMemorySorter

UnsafeExternalSorter

RecordPointerAndKeyPrefix


UnsafeShuffleWriter
AlphaSort-Style Cache Friendly


57
Ptr
Key-Prefix
2x CPU Cache-line Friendly!
Using multiple subclasses of SortDataFormat
simultaneously will prevent JIT inlining.
This affects sort & shuffle performance.
Supports merging compressed records
if compression CODEC supports it (LZF)
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IBM Spark
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Spilling
More Efficient Spilling

Exact data size is known

No need to maintain heuristics & approximations

Controls amount of spilling
Spill Merge on Compressed Records!!

(If compression CODEC supports it - ie. LZF)




58
UnsafeFixedWidthAggregationMap.getPeakMemoryUsedBytes()
Exact Memory
ByteArray Count
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Code Generation
Problem

Boxing creates excessive objects

Expression tree evaluations are costly

JVM can’t inline polymorphic impls
Solution

Codegen by-passes virtual functions

Defer source code generation to each operator, UDF, UDAF

Rewrite and optimize code for overall plan, 8-byte align, etc

Use Scala quasiquote macros for Scala AST source code gen

Use Janino to compile generated source code into bytecode
59
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
IBM | spark.tc
Spark SQL UDF Code Generation
100+ UDFs now generating code
More to come in Spark 1.6+
Details in
SPARK-8159, SPARK-9571
Each Implements
Expression.genCode()!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Creating a Custom UDF with Codegen
Study existing implementations

https://github.com/apache/spark/pull/7214/files
Extend base trait

o.a.s.sql.catalyst.expressions.Expression.genCode()
Register the function

o.a.s.sql.catalyst.analysis.FunctionRegistry.registerFunction()
Augment DataFrame with new UDF (Scala implicits)

o.a.s.sql.functions.scala
Don’t forget about Python!

python.pyspark.sql.functions.py


61
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IBM Spark
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IBM Spark
Who Benefits from Project Tungsten?
Users of DataFrames



All Spark SQL Queries

Catalyst



All RDDs

Serialization, Compression, and Aggregations
62
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Project Tungsten Performance Results
Query Time




Garbage
Collection
63
OOM’d on
Large Dataset!
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IBM Spark
Autoscaling Spark Workers
Spark 1.5+

spark-submit --max-executors
API

SparkContext.addExecutors()

SparkContext.removeExecutors()
Scaling up is easy J
Scaling down is tricky L

RDD cache within Executor JVM is lost

RDD partitions need rebuilding in another Executor JVM
Made possible by External Shuffle Service (Spark 1.2)
64
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IBM Spark
Presentation Outline
 Spark Core: Tuning & Mechanical Sympathy
 Spark SQL: Query Optimizing & Catalyst
65
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IBM Spark
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Spark SQL: Query Optimizing & Catalyst
Explore DataFrames/Datasets/DataSources, Catalyst

Review Partitions, Pruning, Pushdowns, File Formats

Create a Custom DataSource API Implementation

 66
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IBM Spark
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IBM Spark
DataFrames
Inspired by R and Pandas DataFrames

Schema-aware
Cross language support

SQL, Python, Scala, Java, R

Equal performance between all languages
DataFrame is container for logical plan

Lazy transformations represented as tree

Only logical plan is sent from Python -> JVM

Only results returned from JVM -> Python
Supports existing Hive metastore

Small, file-based Hive metastore created by default
DataFrame.rdd returns underlying RDD if needed

67
Use DataFrames
instead of RDDs!!
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Custom UDF and UDAF Support

Study existing implementations

https://github.com/apache/spark/pull/7214/files
Extend base trait


o.a.s.sql.catalyst.expressions.Expression.genCode()
Register the function

o.a.s.sql.catalyst.analysis.FunctionRegistry.registerFunc()
Augment DataFrame with new UDF (Scala implicits)

o.a.s.sql.functions.scala
Don’t forget about Python!

python.pyspark.sql.functions.py
68
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IBM Spark
Spark and Hive
Sparks’ Early Days

Shark: “Hive on Spark”

Spork: “Pig on Spark”
Catalyst Optimizer replaces Hive Optimizer
Always use HiveContext – even if not using Hive!

If no Hive, a small Hive metastore file is created
Spark 1.5+ supports all Hive versions 0.12+

Separate classloaders for isolation

Separate Spark-internal Hive vs User-application Hive
69
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IBM Spark
Catalyst Optimizer



DataFrame Abstract Syntax Tree Transformation 

Subquery elimination: use aliases to collapse subqueries

Constant folding: replace expression with constant

Simplify filters: remove unnecessary filters

Predicate/filter pushdowns: avoid unnecessary data load

Projection collapsing: avoid unnecessary projections
Create Custom Rules

Rules are Scala Case Classes

val newPlan = MyFilterRule(analyzedPlan)
70
Implements
oas.sql.catalyst.rules.Rule
Apply Rule at any stage
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IBM Spark
DataSources API
Relations (o.a.s.sql.sources.interfaces.scala)

BaseRelation (abstract class): Provides schema of data

 
TableScan (impl): Read all data from source 


 
PrunedFilteredScan (impl): Column pruning & predicate pushdowns

 
InsertableRelation (impl): Insert/overwrite data based on SaveMode

RelationProvider (trait/interface): Handle options, BaseRelation factory
Execution (o.a.s.sql.execution.commands.scala)

RunnableCommand (trait/interface): Common commands like EXPLAIN

 
ExplainCommand(impl: case class)

 
CacheTableCommand(impl: case class)
Filters (o.a.s.sql.sources.filters.scala)

Filter (abstract class): Handles all predicates/filters supported by this source

 
EqualTo (impl)

 
GreaterThan (impl)

 
StringStartsWith (impl)
71
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Native Spark SQL DataSources
72
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IBM Spark
Debugging the Query Plan
73
gendersCsvDF.select($"id", $"gender").filter("gender != 'F'").filter("gender != 'M'").explain(true)
DataFrame.queryExecution.logical
DataFrame.queryExecution.analyzed
DataFrame.queryExecution.optimizedPlan
DataFrame.queryExecution.executedPlan
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Visualizing the Query Plan
74
Effectiveness 
of Filter
CPU Cache 

Friendly
Binary Format
 Cost-based
Join Optimization
Similar to
MapReduce
Map-side Join
Peak Memory for
Joins and Aggs
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IBM Spark
JSON Data Source
DataFrame

val ratingsDF = sqlContext.read.format("json")
.load("file:/root/pipeline/datasets/dating/ratings.json.bz2")
-- or –
val ratingsDF = sqlContext.read.json

("file:/root/pipeline/datasets/dating/ratings.json.bz2")
SQL Code
CREATE TABLE genders USING json
OPTIONS 
(path "file:/root/pipeline/datasets/dating/genders.json.bz2")

75
json() convenience method
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IBM Spark
JDBC Data Source
Add Driver to Spark JVM System Classpath

$ export SPARK_CLASSPATH=<jdbc-driver.jar>

DataFrame

val jdbcConfig = Map("driver" -> "org.postgresql.Driver",

 
"url" -> "jdbc:postgresql:hostname:port/database", 

 
"dbtable" -> ”schema.tablename")

df.read.format("jdbc").options(jdbcConfig).load()

SQL

CREATE TABLE genders USING jdbc 


 
OPTIONS (url, dbtable, driver, …)

76
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IBM Spark
Parquet Data Source
Configuration

spark.sql.parquet.filterPushdown=true

spark.sql.parquet.mergeSchema=true

spark.sql.parquet.cacheMetadata=true

spark.sql.parquet.compression.codec=[uncompressed,snappy,gzip,lzo]
DataFrames

val gendersDF = sqlContext.read.format("parquet")

 .load("file:/root/pipeline/datasets/dating/genders.parquet")

gendersDF.write.format("parquet").partitionBy("gender")

 .save("file:/root/pipeline/datasets/dating/genders.parquet") 
SQL

CREATE TABLE genders USING parquet

OPTIONS 

 
(path "file:/root/pipeline/datasets/dating/genders.parquet")

77
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IBM Spark
ORC Data Source
Configuration

spark.sql.orc.filterPushdown=true
DataFrames

val gendersDF = sqlContext.read.format("orc")

 
.load("file:/root/pipeline/datasets/dating/genders")

gendersDF.write.format("orc").partitionBy("gender")

 
.save("file:/root/pipeline/datasets/dating/genders")
SQL

CREATE TABLE genders USING orc

OPTIONS 

 
(path "file:/root/pipeline/datasets/dating/genders")

78
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IBM Spark
Third-Party Spark SQL DataSources
79
spark-packages.org
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IBM Spark
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IBM Spark
CSV DataSource (Databricks)
Github
https://github.com/databricks/spark-csv
Maven

com.databricks:spark-csv_2.10:1.2.0
Code

val gendersCsvDF = sqlContext.read

 
.format("com.databricks.spark.csv")

 
.load("file:/root/pipeline/datasets/dating/gender.csv.bz2")

 
.toDF("id", "gender")
80
toDF() is required if CSV does not contain header
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
ElasticSearch DataSource (Elastic.co)
Github

https://github.com/elastic/elasticsearch-hadoop

Maven

org.elasticsearch:elasticsearch-spark_2.10:2.1.0

Code

val esConfig = Map("pushdown" -> "true", "es.nodes" -> "<hostname>", 


 
 
 
 
 
 
 "es.port" -> "<port>")

df.write.format("org.elasticsearch.spark.sql”).mode(SaveMode.Overwrite)

 
.options(esConfig).save("<index>/<document-type>")

81
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Elasticsearch Tips
Change id field to not_analyzed to avoid indexing
Use term filter to build and cache the query
Perform multiple aggregations in a single request
Adapt scoring function to current trends at query time
82
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IBM Spark
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
AWS Redshift Data Source (Databricks)
Github

https://github.com/databricks/spark-redshift

Maven

com.databricks:spark-redshift:0.5.0

Code

val df: DataFrame = sqlContext.read

 
.format("com.databricks.spark.redshift")

 
.option("url", "jdbc:redshift://<hostname>:<port>/<database>…")

 
.option("query", "select x, count(*) my_table group by x")

 
.option("tempdir", "s3n://tmpdir")

 
.load(...)
83
UNLOAD and copy to tmp
bucket in S3 enables
parallel reads
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
DB2 and BigSQL DataSources (IBM)
Coming Soon!
84
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Cassandra DataSource (DataStax)
Github

https://github.com/datastax/spark-cassandra-connector

Maven

com.datastax.spark:spark-cassandra-connector_2.10:1.5.0-M1

Code

ratingsDF.write

 
.format("org.apache.spark.sql.cassandra")

 
.mode(SaveMode.Append)

 
.options(Map("keyspace"->"<keyspace>",

 
 
 
 
 
 "table"->"<table>")).save(…)

85
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Cassandra Pushdown Support
spark-cassandra-connector/…/o.a.s.sql.cassandra.PredicatePushDown.scala


Pushdown Predicate Rules

1. Only push down no-partition key column predicates with =, >, <, >=, <= predicate

2. Only push down primary key column predicates with = or IN predicate.

3. If there are regular columns in the pushdown predicates, they should have
at least one EQ expression on an indexed column and no IN predicates.

4. All partition column predicates must be included in the predicates to be pushed down,
only the last part of the partition key can be an IN predicate. For each partition column,

only one predicate is allowed.

5. For cluster column predicates, only last predicate can be non-EQ predicate

including IN predicate, and preceding column predicates must be EQ predicates.

If there is only one cluster column predicate, the predicates could be any non-IN predicate.

6. There is no pushdown predicates if there is any OR condition or NOT IN condition.

7. We're not allowed to push down multiple predicates for the same column if any of them

is equality or IN predicate.

86
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
New Cassandra DataSource (?)
By-pass CQL optimized for transactional data

Instead, do bulk reads/writes directly on SSTables

Similar to 5 year old Netflix Open Source project Aegisthus

Promotes Cassandra to first-class Analytics Option

Potentially only part of DataStax Enterprise?!

Please mail a nasty letter to your local DataStax office
87
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IBM Spark
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Rumor of REST DataSource (Databricks)
Coming Soon?






Ask Michael Armbrust
Spark SQL Lead @ Databricks
88
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Custom DataSource (Me and You!)
Coming Right Now!
89
DEMO ALERT!!
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IBM Spark
 spark.tc
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Create a Custom DataSource
Study Existing Native & Third-Party Data Sources
Native
Spark JDBC (o.a.s.sql.execution.datasources.jdbc)

 class JDBCRelation extends BaseRelation

 
with PrunedFilteredScan


 
with InsertableRelation
Third-Party
DataStax Cassandra (o.a.s.sql.cassandra)

 class CassandraSourceRelation extends BaseRelation

 
with PrunedFilteredScan


 
with InsertableRelation!

90
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IBM Spark
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Demo!
Create a Custom DataSource
91
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IBM Spark
Contribute a Custom Data Source
spark-packages.org

Managed by

Contains links to external github projects

Ratings and comments

Declare supported Spark version per package

Kind of like a package manager

Custom Maven Repo ---->
Examples

https://github.com/databricks/spark-csv

https://github.com/datastax/spark-cassandra-connector
92
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Parquet Columnar File Format
Based on Google Dremel 
Collaboration with Twitter and Cloudera
Self-describing, evolving schema
Fast columnar aggregation
Supports filter pushdowns
Columnar storage format
Excellent compression
93
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Types of Compression
Run Length Encoding: Repeated data
Dictionary Encoding: Fixed set of values
Delta, Prefix Encoding: Sorted data
94
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
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Demo!
Demonstrate File Formats, Partition Schemes, and Query Plans
95
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IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Hive JDBC ODBC ThriftServer
Allow BI Tools to Query and Process Spark Data
Register Permanent Table

CREATE TABLE ratings(fromuserid INT, touserid INT, rating INT) 

USING org.apache.spark.sql.json 

OPTIONS (path "datasets/dating/ratings.json.bz2")
Register Temp Table

ratingsDF.registerTempTable("ratings_temp") 
Configuration

spark.sql.thriftServer.incrementalCollect=true

spark.driver.maxResultSize > 10gb (default)
96
Power of data. Simplicity of design. Speed of innovation.
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
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Demo!
Query and Process Spark Data from Beeline and/or Tableau
97
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Power of data. Simplicity of design. Speed of innovation.
IBM Spark
More Relevant Links
http://meetup.com/Advanced-Apache-Spark-Meetup
http://advancedspark.com
http://github.com/fluxcapacitor/pipeline
http://hub.docker.com/r/fluxcapacitor/pipeline
http://sortbenchmark.org/ApacheSpark2014.pd
https://databricks.com/blog/2014/11/05/spark-officially-sets-a-new-record-in-large-sca
le-sorting.html
http://0x0fff.com/spark-architecture-shuffle/
http://www.cs.berkeley.edu/~kubitron/courses/cs262a-F13/projects/reports/project16_
report.pdf
http://stackoverflow.com/questions/763262/how-does-one-write-code-that-best-utilize
s-the-cpu-cache-to-improve-performance
http://www.aristeia.com/TalkNotes/ACCU2011_CPUCaches.pdf
http://mishadoff.com/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/
http://docs.scala-lang.org/overviews/quasiquotes/intro.html
http://lwn.net/Articles/252125/ (Memory Part 2: CPU Caches)
http://lwn.net/Articles/255364/ (Memory Part 5: What Programmers Can Do)
https://www.safaribooksonline.com/library/view/java-performance-the/9781449363512/
ch04.html
http://web.eece.maine.edu/~vweaver/projects/perf_events/perf_event_open.html
http://www.brendangregg.com/perf.html
https://perf.wiki.kernel.org/index.php/Tutorial
http://techblog.netflix.com/2015/07/java-in-flames.html
http://techblog.netflix.com/2015/04/introducing-vector-netflixs-on-host.html
http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#Java
http://sortbenchmark.org/ApacheSpark2014.pdf
https://databricks.com/blog/2014/11/05/spark-officially-sets-a-new-record-in-large-sca
le-sorting.html
http://0x0fff.com/spark-architecture-shuffle/
http://www.cs.berkeley.edu/~kubitron/courses/cs262a-F13/projects/reports/project16_
report.pdf
http://stackoverflow.com/questions/763262/how-does-one-write-code-that-best-utilize
s-the-cpu-cache-to-improve-performance
http://www.aristeia.com/TalkNotes/ACCU2011_CPUCaches.pdf
http://mishadoff.com/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/
http://docs.scala-lang.org/overviews/quasiquotes/intro.html

98
http://lwn.net/Articles/252125/ <-- Memory Part 2: CPU Caches
http://lwn.net/Articles/255364/ <-- Memory Part 5: What Programmers Can Do
http://antirez.com/news/75
http://esumitra.github.io/algebird-boston-spark/#/
https://github.com/fluxcapacitor/pipeline
http://www.cs.umd.edu/~samir/498/Amazon-Recommendations.pdf
http://blog.echen.me/2011/10/24/winning-the-netflix-prize-a-summary/
http://spark.apache.org/docs/latest/ml-guide.html
http://techblog.netflix.com/2012/04/netflix-recommendations-beyond-5-stars.html (part 1)
http://techblog.netflix.com/2012/06/netflix-recommendations-beyond-5-stars.html (part 2)
http://www.brendangregg.com/blog/2015-11-06/java-mixed-mode-flame-graphs.html
Power of data. Simplicity of design. Speed of innovation.
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IBM Spark
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What’s Next?
After Dark 1.6
99
Power of data. Simplicity of design. Speed of innovation.
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IBM Spark
Incorporate New Features of Spark 1.6





https://docs.cloud.databricks.com/docs/spark/1.6/index.html
100
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
What’s Next?
Autoscaling Docker/Spark Workers

Completely Docker-based

Docker Compose, Google Kubernetes
Lots of Demos and Examples

More Zeppelin & IPython/Jupyter notebooks

More advanced analytics use cases
Performance Tuning and Profiling

Work closely with Netflix & Databricks

Identify & fix Spark performance bottlenecks

101
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Upcoming Meetups and Conferences
London Spark Meetup (Oct 12th)
Scotland Data Science Meetup (Oct 13th)
Dublin Spark Meetup (Oct 15th)
Barcelona Spark Meetup (Oct 20th)
Madrid Big Data Meetup (Oct 22nd)
Paris Spark Meetup (Oct 26th)
Amsterdam Spark Summit (Oct 27th)
Brussels Spark Meetup (Oct 30th)
Zurich Big Data Meetup (Nov 2nd)
Geneva Spark Meetup (Nov 5th)
San Francisco Datapalooza (Nov 10th)
San Francisco Advanced Spark (Nov 12th)
102
Oslo Big Data Hadoop Meetup (Nov 19th)
Helsinki Spark Meetup (Nov 20th)
Stockholm Spark Meetup (Nov 23rd)
Copenhagen Spark Meetup (Nov 25th)
Budapest Spark Meetup (Nov 26th)
Istanbul Spark Meetup (Nov 28th)
Singapore Strata Conference (Dec 1st)
Sydney Spark Meetup (Dec 7th)
Melbourne Spark Meetup (Dec 9th)
San Francisco Advanced Spark (Dec 10th)
Toronto Spark Meetup (Dec 14th)
Austin Data Days Conference (Jan 16th)
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
Thank You!!!
Chris Fregly
IBM Spark Technology Center 
San Francisco, California
(Find me on LinkedIn, Twitter, Github)
Relevant Links
advancedspark.com
Signup for the book & global meetup!
github.com/fluxcapacitor/pipeline
Clone, contribute, and commit code!
hub.docker.com/r/fluxcapacitor/pipeline/wiki
Run all demos in your own environment with Docker!
103
Power of data. Simplicity of design. Speed of innovation.
IBM Spark
 spark.tc
Power of data. Simplicity of design. Speed of innovation.
IBM Spark

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Stockholm Spark Meetup Nov 23 2015 Spark After Dark 1.5

  • 1. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc After Dark 1.5 Stockholm Spark Meetup Chris Fregly Principal Data Solutions Engineer We’re Hiring - Only Nice People! Nov 23rd, 2015
  • 2. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Who Am I? 2 Streaming Data Engineer Open Source Committer
 Data Solutions Engineer
 Apache Contributor Principal Data Solutions Engineer IBM Technology Center Founder Advanced Apache Meetup Author Advanced . Due 2016 My Ma’s First Time in California
  • 3. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Random Slide: More Ma “First Time” Pics 3 In California Using Chopsticks Using “New” iPhone
  • 4. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Upcoming Meetups and Conferences London Spark Meetup (Oct 12th) Scotland Data Science Meetup (Oct 13th) Dublin Spark Meetup (Oct 15th) Barcelona Spark Meetup (Oct 20th) Madrid Big Data Meetup (Oct 22nd) Paris Spark Meetup (Oct 26th) Amsterdam Spark Summit (Oct 27th) Brussels Spark Meetup (Oct 30th) Zurich Big Data Meetup (Nov 2nd) Geneva Spark Meetup (Nov 5th) San Francisco Datapalooza (Nov 10th) San Francisco Advanced Spark (Nov 12th) 4 Oslo Big Data Hadoop Meetup (Nov 19th) Helsinki Spark Meetup (Nov 20th) Stockholm Spark Meetup (Nov 23rd) Copenhagen Spark Meetup (Nov 25th) Budapest Spark Meetup (Nov 26th) Istanbul Spark Meetup (Nov 28th) Singapore Strata Conference (Dec 1st) Sydney Spark Meetup (Dec 7th) Melbourne Spark Meetup (Dec 9th) San Francisco Advanced Spark (Dec 10th) Toronto Spark Meetup (Dec 14th) Austin Data Days Conference (Jan 16th)
  • 5. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Advanced Apache Spark Meetup Meetup Metrics 1600+ Members in just 4 mos! Top 5 Most Active Spark Meetup!! Meetup Goals   Dig deep into codebase of Spark and related projects   Study integrations of Cassandra, ElasticSearch, Tachyon, S3, BlinkDB, Mesos, YARN, Kafka, R   Surface and share patterns and idioms of these well-designed, distributed, big data components
  • 6. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark All Slides and Code Are Available! advancedspark.com slideshare.net/cfregly github.com/fluxcapacitor hub.docker.com/r/fluxcapacitor 6
  • 7. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark What is “ After Dark”? Spark-based, Advanced Analytics Reference App End-to-End, Scalable, Real-time Big Data Pipeline Demo Spark and Related Open Source Projects 7 github.com/fluxcapacitor
  • 8. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Live, Interactive Demo! sparkafterdark.com 8
  • 9. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Audience Participation Needed!! 9 You -> Audience Instructions   Go to sparkafterdark.com   Click 3 actresses and 3 actors   Wait for us to analyze together! Links To Do This Yourself!   github.com/fluxcapacitor   hub.docker.com/r/fluxcapacitor Data -> Scientist EU Safe Harbor Disclaimer
 This is Totally Anonymous!
  • 10. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Tools of This Talk 10   Kafka   Redis   Docker   Ganglia   Cassandra   Parquet, JSON, ORC, Avro   Apache Zeppelin Notebooks   Spark SQL, DataFrames, Hive   ElasticSearch, Logstash, Kibana   Spark ML, GraphX, Stanford CoreNLP … github.com/fluxcapacitor hub.docker.com/r/fluxcapacitor
  • 11. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Themes of this Talk  Filter  Off-Heap  Parallelize  Approximate  Find Similarity  Minimize Seeks  Maximize Scans  Customize for Workload  Tune Performance At Every Layer 11   Be Nice, Collaborate! Like my Ma!!
  • 12. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Presentation Outline  Spark Core: Tuning & Mechanical Sympathy  Spark SQL: Query Optimizing & Catalyst 12
  • 13. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Spark Core: Tuning & Mechanical Sympathy Understand and Acknowledge Mechanical Sympathy Study AlphaSort and 100TB GraySort Challenge Dive Deep into Project Tungsten 13
  • 14. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Mechanical Sympathy Hardware and software working together in harmony. - Martin Thompson http://mechanical-sympathy.blogspot.com Whatever your data structure, my array will beat it. - Scott Meyers Every C++ Book, basically 14 Hair Sympathy - Bruce Jenner
  • 15. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Spark and Mechanical Sympathy 15 Project 
 Tungsten (Spark 1.4-1.6+) GraySort Challenge (Spark 1.1-1.2) Minimize Memory and GC Maximize CPU Cache Locality Saturate Network I/O Saturate Disk I/O
  • 16. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark AlphaSort Technique: Sort 100 Bytes Recs 16 Value Ptr Key Dereference Not Required! AlphaSort List [(Key, Pointer)] Key is directly available for comparison Naïve List [Pointer] Must dereference key for comparison Ptr Dereference for Key Comparison Key
  • 17. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Line and Memory Sympathy Key (10 bytes)+Pointer (*4 bytes)*Compressed OOPs = 14 bytes 17 Key Ptr Not CPU Cache-line Friendly! Ptr Key-Prefix 2x CPU Cache-line Friendly! Key-Prefix (4 bytes) + Pointer (4 bytes) = 8 bytes Key (10 bytes)+Pad (2 bytes)+Pointer (4 bytes)
 = 16 bytes Key Ptr Pad /Pad CPU Cache-line Friendly!
  • 18. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Performance Comparison 18
  • 19. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Similar Trick: Direct Cache Access (DCA) Pull out packet header along side pointer to payload 19
  • 20. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Line Sizes 20 My
 Laptop My
 SoftLayer
 BareMetal
  • 21. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Cache Hits: Sequential v Random Access 21
  • 22. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Mechanical Sympathy CPU Cache Lines and Matrix Multiplication 22
  • 23. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Naïve Matrix Multiplication // Dot product of each row & column vector for (i <- 0 until numRowA) for (j <- 0 until numColsB) for (k <- 0 until numColsA) res[ i ][ j ] += matA[ i ][ k ] * matB[ k ][ j ]; 23 Bad: Row-wise traversal, not using CPU cache line,
 ineffective pre-fetching
  • 24. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Friendly Matrix Multiplication // Transpose B for (i <- 0 until numRowsB) for (j <- 0 until numColsB) matBT[ i ][ j ] = matB[ j ][ i ]; 
 // Modify dot product calculation for B Transpose for (i <- 0 until numRowsA) for (j <- 0 until numColsB) for (k <- 0 until numColsA) res[ i ][ j ] += matA[ i ][ k ] * matBT[ j ][ k ]; 24 Good: Full CPU cache line,
 effective prefetching OLD: res[ i ][ j ] += matA[ i ][ k ] * matB [ k ] [ j ]; Reference j
 before k
  • 25. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Instrumenting and Monitoring CPU Use Linux perf command! 25 http://www.brendangregg.com/blog/2015-11-06/java-mixed-mode-flame-graphs.html
  • 26. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Demo! Compare CPU Naïve & Cache-Friendly Matrix Multiplication 26
  • 27. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Results of Matrix Multiply Comparison Cache-Friendly 
 Matrix Multiply 27 Naive 
 Matrix Multiply perf stat –event L1-dcache-load-misses,L1-dcache-prefetch-misses,LLC-load-misses, LLC-prefetch-misses,cache-misses,stalled-cycles-frontend ~27x ~13x ~13x ~2x ~10x 550 hp 55 hp
  • 28. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Mechanical Sympathy Updating a Tuple of Counters in Thread-safe Manner 28
  • 29. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Naïve Case Class Counters case class MyTuple(left: Int, right: Int) object CacheNaiveCaseClassCounters { var tuple = new MyTuple(0,0) … def increment(leftIncrement: Int, rightIncrement: Int) : MyTuple = { tuple.synchronized { tuple = new MyTuple(tuple.left + leftIncrement, tuple.right + rightIncrement) tuple } } } 29
  • 30. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Naïve Tuple Counters object CacheNaiveTupleIncrement { var tuple = (0,0) … def increment(leftIncrement: Int, rightIncrement: Int) : (Int, Int) = { tuple.synchronized { tuple = (tuple._1 + leftIncrement, tuple._2 + rightIncrement) tuple } } } 30
  • 31. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU Cache Friendly Lock-Free Counters object CacheFriendlyLockFreeCounters { // a single Long (8-bytes) will maintain 2 separate Ints (4-bytes each) val tuple = new AtomicLong() … def increment(leftIncrement: Int, rightIncrement: Int) : Long = { var originalLong = 0L var updatedLong = 0L do { originalLong = tuple.get() val originalRightInt = originalLong.toInt // cast originalLong to Int to get right counter val originalLeftInt = (originalLong >>> 32).toInt // shift right to get left counter val updatedRightInt = originalRightInt + rightIncrement // increment right counter val updatedLeftInt = originalLeftInt + leftIncrement // increment left counter updatedLong = updatedLeftInt // update the new long with the left counter updatedLong = updatedLong << 32 // shift the new long left updatedLong += updatedRightInt // update the new long with the right counter } while (tuple.compareAndSet(originalLong, updatedLong) == false) updatedLong } 31 Q: Why not @volatile long? A: JVM (Java Memory Model)
 does not guarantee atomic
 updates of 64-bit longs, doubles Lock-free, compare and set
  • 32. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Demo! Compare Naïve & Cache-Friendly Tuple Counter Synchronization 32
  • 33. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Results of Counters Comparison Naïve Case Class Counters Naïve Tuple Counters Cache Friendly,
 Lock-Free Counters ~2x ~1.5x ~3.5x ~2x ~2x ~1.5x ~1.5x ~1.5x
  • 34. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Profiling Visualizations: Flame Graphs 34 Example: Spark Word Count Java Stack Traces are Good! (-XX:-Inline -XX:+PreserveFramePointer) Plateaus
 are Bad!!
  • 35. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc 100TB GraySort Challenge Sort 100TB of 100-Byte Records with 10-byte Keys Custom Data Structs & Algos for Sort & Shuffle Saturate Network and Disk I/O Controllers 35
  • 36. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark 100TB GraySort Challenge Results 36 Performance Goals  Saturate Network I/O  Saturate Disk I/O  Maxminize Throughput (2013) (2014) EC2 (i2.8xlarge) (2014)
  • 37. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Winning Hardware Configuration Compute 206 Workers, 1 Master (AWS EC2 i2.8xlarge) 32 Intel Xeon CPU E5-2670 @ 2.5 Ghz 244 GB RAM, 8 x 800GB SSD, RAID 0 striping, ext4 3 GBps mixed read/write disk I/O per node Network AWS Placement Groups, VPC, Enhanced Networking Single Root I/O Virtualization (SR-IOV) 10 Gbps, low latency, low jitter (iperf: ~9.5 Gbps) 37 Q: Why only 206? A: Network is saturated @ 206
  • 38. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Winning Software Configuration Spark 1.2, OpenJDK 1.7 Disable caching, compression, spec execution, shuffle spill Force NODE_LOCAL task scheduling for optimal data locality HDFS 2.4.1 short-circuit local reads, 2x replication Empirically chose between 4-6 partitions per cpu 206 nodes * 32 cores = 6592 cores 6592 cores * 4 = 26,368 partitions 6592 cores * 6 = 39,552 partitions 6592 cores * 4.25 = 28,000 partitions (empirical best) Range partitioning takes advantage of sequential keyspace Required ~10s of sampling 79 keys from in each partition 38
  • 39. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark New Sort Shuffle Manager for Spark 1.2 Original “hash-based” New “sort-based” ①  Use less OS resources (socket buffers, file descriptors) ②  TimSort partitions in-memory ③  MergeSort partitions on-disk into a single master file ④  Serve partitions from master file: seek once, sequential scan 39
  • 40. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Asynchronous Network Module Switch to asyncronous Netty vs. synchronous java.nio Switch to zero-copy epoll Use only kernel-space between disk and network controllers Custom memory management spark.shuffle.blockTransferService=netty Spark-Netty Performance Tuning spark.shuffle.io.preferDirectBuffers=true Reuse off-heap buffers spark.shuffle.io.numConnectionsPerPeer=8 (for example) Increase to saturate hosts with multiple disks (8x800 SSD) 40 Details in SPARK-2468
  • 41. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Custom Algorithms and Data Structures Optimized for sort & shuffle workloads o.a.s.util.collection.TimSort[K,V] Based on JDK 1.7 TimSort Performs best with partially-sorted runs Optimized for elements of (K,V) pairs Sorts impl of SortDataFormat (ie. KVArraySortDataFormat) o.a.s.util.collection.AppendOnlyMap Open addressing hash, quadratic probing Array of [(K, V), (K, V)] Good memory locality Keys never removed, values only append 41
  • 42. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Daytona GraySort Challenge Goal Success 1.1 Gbps/node network I/O (Reducers)
 Theoretical max = 1.25 Gbps for 10 GB ethernet 3 GBps/node disk I/O (Mappers) 42 Aggregate 
 Cluster Network I/O! 220 Gbps / 206 nodes ~= 1.1 Gbps per node
  • 43. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Shuffle Performance Tuning Tips Hash Shuffle Manager (Deprecated) spark.shuffle.consolidateFiles (Mapper) o.a.s.shuffle.FileShuffleBlockResolver Intermediate Files Increase spark.shuffle.file.buffer (Reducer) Increase spark.reducer.maxSizeInFlight if memory allows Use Smaller Number of Larger Executors Minimizes intermediate files and overall shuffle More opportunity for PROCESS_LOCAL SQL: BroadcastHashJoin vs. ShuffledHashJoin spark.sql.autoBroadcastJoinThreshold Use DataFrame.explain(true) or EXPLAIN to verify 43 Many Threads (1 per CPU)
  • 44. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Project Tungsten Data Struts & Algos Operate Directly on Byte Arrays Maximize CPU Cache Locality, Minimize GC Utilize Dynamic Code Generation 44 SPARK-7076 (Spark 1.4)
  • 45. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Why is CPU the Bottleneck? CPU is used for serialization, hashing, compression GraySort optimizations improved network & shuffle Network and Disk I/O bandwidth are relatively high More partitioning, pruning, predicate pushdowns Better columnar formats reduce disk I/O bottleneck 45
  • 46. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Yet Another Spark Shuffle Manager! spark.shuffle.manager = hash (Deprecated) < 10,000 reducers Output partition file hashes the key of (K,V) pair Mapper creates an output file per partition Leads to M*P output files for all partitions sort (GraySort Challenge) > 10,000 reducers Default from Spark 1.2-1.5 Mapper creates single output file for all partitions Minimizes OS resources, netty + epoll optimizes network I/O, disk I/O, and memory Uses custom data structures and algorithms for sort-shuffle workload Wins Daytona GraySort Challenge tungsten-sort (Project Tungsten) Default since 1.5 Modification of existing sort-based shuffle Uses com.misc.Unsafe for self-managed memory and garbage collection Maximize CPU utilization and cache locality with AlphaSort-inspired binary data structures/algorithms Perform joins, sorts, and other operators on both serialized and compressed byte buffers 46
  • 47. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CPU & Memory Optimizations Custom Managed Memory Reduces GC overhead Both on and off heap Exact size calculations Direct Binary Processing Operate on serialized/compressed arrays Kryo can reorder/sort serialized records LZF can reorder/sort compressed records More CPU Cache-aware Data Structs & Algorithms o.a.s.sql.catalyst.expression.UnsafeRow o.a.s.unsafe.map.BytesToBytesMap Code Generation (default in 1.5) Generate source code from overall query plan 100+ UDFs converted to use code generation 47 UnsafeFixedWithAggregationMap TungstenAggregationIterator CodeGenerator GeneratorUnsafeRowJoiner UnsafeSortDataFormat UnsafeShuffleSortDataFormat PackedRecordPointer UnsafeRow UnsafeInMemorySorter UnsafeExternalSorter UnsafeShuffleWriter Mostly Same Join Code, UnsafeProjection UnsafeShuffleManager UnsafeShuffleInMemorySorter UnsafeShuffleExternalSorter Details in SPARK-7075
  • 48. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark sun.misc.Unsafe 48 Info addressSize() pageSize() Objects allocateInstance() objectFieldOffset() Classes staticFieldOffset() defineClass() defineAnonymousClass() ensureClassInitialized() Synchronization monitorEnter() tryMonitorEnter() monitorExit() compareAndSwapInt() putOrderedInt() Arrays arrayBaseOffset() arrayIndexScale() Memory allocateMemory() copyMemory() freeMemory() getAddress() – not guaranteed after GC getInt()/putInt() getBoolean()/putBoolean() getByte()/putByte() getShort()/putShort() getLong()/putLong() getFloat()/putFloat() getDouble()/putDouble() getObjectVolatile()/putObjectVolatile() Used by 
 Tungsten
  • 49. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Spark + com.misc.Unsafe 49 org.apache.spark.sql.execution. aggregate.SortBasedAggregate aggregate.TungstenAggregate aggregate.AggregationIterator aggregate.udaf aggregate.utils SparkPlanner rowFormatConverters UnsafeFixedWidthAggregationMap UnsafeExternalSorter UnsafeExternalRowSorter UnsafeKeyValueSorter UnsafeKVExternalSorter local.ConvertToUnsafeNode local.ConvertToSafeNode local.HashJoinNode local.ProjectNode local.LocalNode local.BinaryHashJoinNode local.NestedLoopJoinNode joins.HashJoin joins.HashSemiJoin joins.HashedRelation joins.BroadcastHashJoin joins.ShuffledHashOuterJoin (not yet converted) joins.BroadcastHashOuterJoin joins.BroadcastLeftSemiJoinHash joins.BroadcastNestedLoopJoin joins.SortMergeJoin joins.LeftSemiJoinBNL joins.SortMergerOuterJoin Exchange SparkPlan UnsafeRowSerializer SortPrefixUtils sort basicOperators aggregate.SortBasedAggregationIterator aggregate.TungstenAggregationIterator datasources.WriterContainer datasources.json.JacksonParser datasources.jdbc.JDBCRDD org.apache.spark. unsafe.Platform unsafe.KVIterator unsafe.array.LongArray unsafe.array.ByteArrayMethods unsafe.array.BitSet unsafe.bitset.BitSetMethods unsafe.hash.Murmur3_x86_32 unsafe.map.BytesToBytesMap unsafe.map.HashMapGrowthStrategy unsafe.memory.TaskMemoryManager unsafe.memory.ExecutorMemoryManager unsafe.memory.MemoryLocation unsafe.memory.UnsafeMemoryAllocator unsafe.memory.MemoryAllocator (trait/interface) unsafe.memory.MemoryBlock unsafe.memory.HeapMemoryAllocator unsafe.memory.ExecutorMemoryManager unsafe.sort.RecordComparator unsafe.sort.PrefixComparator unsafe.sort.PrefixComparators unsafe.sort.UnsafeSorterSpillWriter serializer.DummySerializationInstance shuffle.unsafe.UnsafeShuffleManager shuffle.unsafe.UnsafeShuffleSortDataFormat shuffle.unsafe.SpillInfo shuffle.unsafe.UnsafeShuffleWriter shuffle.unsafe.UnsafeShuffleExternalSorter shuffle.unsafe.PackedRecordPointer shuffle.ShuffleMemoryManager util.collection.unsafe.sort.UnsafeSorterSpillMerger util.collection.unsafe.sort.UnsafeSorterSpillReader util.collection.unsafe.sort.UnsafeSorterSpillWriter util.collection.unsafe.sort.UnsafeShuffleInMemorySorter util.collection.unsafe.sort.UnsafeInMemorySorter util.collection.unsafe.sort.RecordPointerAndKeyPrefix util.collection.unsafe.sort.UnsafeSorterIterator network.shuffle.ExternalShuffleBlockResolver scheduler.Task rdd.SqlNewHadoopRDD executor.Executor org.apache.spark.sql.catalyst.expressions. regexpExpressions BoundAttribute SortOrder SpecializedGetters ExpressionEvalHelper UnsafeArrayData UnsafeReaders UnsafeMapData Projection LiteralGeneartor UnsafeRow JoinedRow SpecializedGetters InputFileName SpecificMutableRow codegen.CodeGenerator codegen.GenerateProjection codegen.GenerateUnsafeRowJoiner codegen.GenerateSafeProjection codegen.GenerateUnsafeProjection codegen.BufferHolder codegen.UnsafeRowWriter codegen.UnsafeArrayWriter complexTypeCreator rows literals misc stringExpressions Over 200 source files affected!!
  • 50. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Traditional Java Object Row Layout 4-byte String Multi-field Object 50
  • 51. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Custom Data Structures for Workload UnsafeRow (Dense Binary Row) TaskMemoryManager (Virtual Memory Address) BytesToBytesMap (Dense Binary HashMap) 51 Dense, 8-bytes per field (word-aligned) Key Ptr AlphaSort-Style (Key + Pointer) OS-Style Memory Paging
  • 52. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark UnsafeRow Layout Example 52 Pre-Tungsten Tungsten
  • 53. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Custom Memory Management o.a.s.memory.
 TaskMemoryManager & MemoryConsumer Memory management: virtual memory allocation, pageing Off-heap: direct 64-bit address On-heap: 13-bit page num + 27-bit page offset o.a.s.shuffle.sort. PackedRecordPointer 64-bit word (24-bit partition key, (13-bit page num, 27-bit page offset)) o.a.s.unsafe.types. UTF8String Primitive Array[Byte] 53 2^13 pages * 2^27 page size = 1 TB RAM per Task
  • 54. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark UnsafeFixedWidthAggregationMap Aggregations o.a.s.sql.execution.
 UnsafeFixedWidthAggregationMap Uses BytesToBytesMap In-place updates of serialized data No object creation on hot-path Improved external agg support No OOM’s for large, single key aggs o.a.s.sql.catalyst.expression.codegen. GenerateUnsafeRowJoiner Combine 2 UnsafeRows into 1 o.a.s.sql.execution.aggregate. TungstenAggregate & TungstenAggregationIterator Operates directly on serialized, binary UnsafeRow 2 Steps: hash-based agg (grouping), then sort-based agg Supports spilling and external merge sorting 54
  • 55. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Equality Bitwise comparison on UnsafeRow No need to calculate equals(), hashCode() Row 1 Equals! Row 2 55
  • 56. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Joins Surprisingly, not many code changes o.a.s.sql.catalyst.expressions. UnsafeProjection Converts InternalRow to UnsafeRow 56
  • 57. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Sorting o.a.s.util.collection.unsafe.sort. UnsafeSortDataFormat UnsafeInMemorySorter UnsafeExternalSorter RecordPointerAndKeyPrefix
 UnsafeShuffleWriter AlphaSort-Style Cache Friendly 57 Ptr Key-Prefix 2x CPU Cache-line Friendly! Using multiple subclasses of SortDataFormat simultaneously will prevent JIT inlining. This affects sort & shuffle performance. Supports merging compressed records if compression CODEC supports it (LZF)
  • 58. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Spilling More Efficient Spilling Exact data size is known No need to maintain heuristics & approximations Controls amount of spilling Spill Merge on Compressed Records!! (If compression CODEC supports it - ie. LZF) 58 UnsafeFixedWidthAggregationMap.getPeakMemoryUsedBytes() Exact Memory ByteArray Count
  • 59. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Code Generation Problem Boxing creates excessive objects Expression tree evaluations are costly JVM can’t inline polymorphic impls Solution Codegen by-passes virtual functions Defer source code generation to each operator, UDF, UDAF Rewrite and optimize code for overall plan, 8-byte align, etc Use Scala quasiquote macros for Scala AST source code gen Use Janino to compile generated source code into bytecode 59
  • 60. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc IBM | spark.tc Spark SQL UDF Code Generation 100+ UDFs now generating code More to come in Spark 1.6+ Details in SPARK-8159, SPARK-9571 Each Implements Expression.genCode()!
  • 61. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Creating a Custom UDF with Codegen Study existing implementations https://github.com/apache/spark/pull/7214/files Extend base trait o.a.s.sql.catalyst.expressions.Expression.genCode() Register the function o.a.s.sql.catalyst.analysis.FunctionRegistry.registerFunction() Augment DataFrame with new UDF (Scala implicits) o.a.s.sql.functions.scala Don’t forget about Python! python.pyspark.sql.functions.py 61
  • 62. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Who Benefits from Project Tungsten? Users of DataFrames All Spark SQL Queries Catalyst All RDDs Serialization, Compression, and Aggregations 62
  • 63. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Project Tungsten Performance Results Query Time Garbage Collection 63 OOM’d on Large Dataset!
  • 64. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Autoscaling Spark Workers Spark 1.5+ spark-submit --max-executors API SparkContext.addExecutors() SparkContext.removeExecutors() Scaling up is easy J Scaling down is tricky L RDD cache within Executor JVM is lost RDD partitions need rebuilding in another Executor JVM Made possible by External Shuffle Service (Spark 1.2) 64
  • 65. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Presentation Outline  Spark Core: Tuning & Mechanical Sympathy  Spark SQL: Query Optimizing & Catalyst 65
  • 66. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Spark SQL: Query Optimizing & Catalyst Explore DataFrames/Datasets/DataSources, Catalyst Review Partitions, Pruning, Pushdowns, File Formats Create a Custom DataSource API Implementation 66
  • 67. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark DataFrames Inspired by R and Pandas DataFrames Schema-aware Cross language support SQL, Python, Scala, Java, R Equal performance between all languages DataFrame is container for logical plan Lazy transformations represented as tree Only logical plan is sent from Python -> JVM Only results returned from JVM -> Python Supports existing Hive metastore Small, file-based Hive metastore created by default DataFrame.rdd returns underlying RDD if needed 67 Use DataFrames instead of RDDs!!
  • 68. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Custom UDF and UDAF Support Study existing implementations https://github.com/apache/spark/pull/7214/files Extend base trait
 o.a.s.sql.catalyst.expressions.Expression.genCode() Register the function o.a.s.sql.catalyst.analysis.FunctionRegistry.registerFunc() Augment DataFrame with new UDF (Scala implicits) o.a.s.sql.functions.scala Don’t forget about Python! python.pyspark.sql.functions.py 68
  • 69. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Spark and Hive Sparks’ Early Days Shark: “Hive on Spark” Spork: “Pig on Spark” Catalyst Optimizer replaces Hive Optimizer Always use HiveContext – even if not using Hive! If no Hive, a small Hive metastore file is created Spark 1.5+ supports all Hive versions 0.12+ Separate classloaders for isolation Separate Spark-internal Hive vs User-application Hive 69
  • 70. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Catalyst Optimizer DataFrame Abstract Syntax Tree Transformation Subquery elimination: use aliases to collapse subqueries Constant folding: replace expression with constant Simplify filters: remove unnecessary filters Predicate/filter pushdowns: avoid unnecessary data load Projection collapsing: avoid unnecessary projections Create Custom Rules Rules are Scala Case Classes val newPlan = MyFilterRule(analyzedPlan) 70 Implements oas.sql.catalyst.rules.Rule Apply Rule at any stage
  • 71. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark DataSources API Relations (o.a.s.sql.sources.interfaces.scala) BaseRelation (abstract class): Provides schema of data TableScan (impl): Read all data from source PrunedFilteredScan (impl): Column pruning & predicate pushdowns InsertableRelation (impl): Insert/overwrite data based on SaveMode RelationProvider (trait/interface): Handle options, BaseRelation factory Execution (o.a.s.sql.execution.commands.scala) RunnableCommand (trait/interface): Common commands like EXPLAIN ExplainCommand(impl: case class) CacheTableCommand(impl: case class) Filters (o.a.s.sql.sources.filters.scala) Filter (abstract class): Handles all predicates/filters supported by this source EqualTo (impl) GreaterThan (impl) StringStartsWith (impl) 71
  • 72. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Native Spark SQL DataSources 72
  • 73. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Debugging the Query Plan 73 gendersCsvDF.select($"id", $"gender").filter("gender != 'F'").filter("gender != 'M'").explain(true) DataFrame.queryExecution.logical DataFrame.queryExecution.analyzed DataFrame.queryExecution.optimizedPlan DataFrame.queryExecution.executedPlan
  • 74. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Visualizing the Query Plan 74 Effectiveness of Filter CPU Cache 
 Friendly Binary Format Cost-based Join Optimization Similar to MapReduce Map-side Join Peak Memory for Joins and Aggs
  • 75. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark JSON Data Source DataFrame val ratingsDF = sqlContext.read.format("json") .load("file:/root/pipeline/datasets/dating/ratings.json.bz2") -- or – val ratingsDF = sqlContext.read.json
 ("file:/root/pipeline/datasets/dating/ratings.json.bz2") SQL Code CREATE TABLE genders USING json OPTIONS (path "file:/root/pipeline/datasets/dating/genders.json.bz2") 75 json() convenience method
  • 76. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark JDBC Data Source Add Driver to Spark JVM System Classpath $ export SPARK_CLASSPATH=<jdbc-driver.jar> DataFrame val jdbcConfig = Map("driver" -> "org.postgresql.Driver", "url" -> "jdbc:postgresql:hostname:port/database", "dbtable" -> ”schema.tablename") df.read.format("jdbc").options(jdbcConfig).load() SQL CREATE TABLE genders USING jdbc 
 OPTIONS (url, dbtable, driver, …) 76
  • 77. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Parquet Data Source Configuration spark.sql.parquet.filterPushdown=true spark.sql.parquet.mergeSchema=true spark.sql.parquet.cacheMetadata=true spark.sql.parquet.compression.codec=[uncompressed,snappy,gzip,lzo] DataFrames val gendersDF = sqlContext.read.format("parquet") .load("file:/root/pipeline/datasets/dating/genders.parquet") gendersDF.write.format("parquet").partitionBy("gender") .save("file:/root/pipeline/datasets/dating/genders.parquet") SQL CREATE TABLE genders USING parquet OPTIONS (path "file:/root/pipeline/datasets/dating/genders.parquet") 77
  • 78. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark ORC Data Source Configuration spark.sql.orc.filterPushdown=true DataFrames val gendersDF = sqlContext.read.format("orc") .load("file:/root/pipeline/datasets/dating/genders") gendersDF.write.format("orc").partitionBy("gender") .save("file:/root/pipeline/datasets/dating/genders") SQL CREATE TABLE genders USING orc OPTIONS (path "file:/root/pipeline/datasets/dating/genders") 78
  • 79. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Third-Party Spark SQL DataSources 79 spark-packages.org
  • 80. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark CSV DataSource (Databricks) Github https://github.com/databricks/spark-csv Maven com.databricks:spark-csv_2.10:1.2.0 Code val gendersCsvDF = sqlContext.read .format("com.databricks.spark.csv") .load("file:/root/pipeline/datasets/dating/gender.csv.bz2") .toDF("id", "gender") 80 toDF() is required if CSV does not contain header
  • 81. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark ElasticSearch DataSource (Elastic.co) Github https://github.com/elastic/elasticsearch-hadoop Maven org.elasticsearch:elasticsearch-spark_2.10:2.1.0 Code val esConfig = Map("pushdown" -> "true", "es.nodes" -> "<hostname>", 
 "es.port" -> "<port>") df.write.format("org.elasticsearch.spark.sql”).mode(SaveMode.Overwrite) .options(esConfig).save("<index>/<document-type>") 81
  • 82. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Elasticsearch Tips Change id field to not_analyzed to avoid indexing Use term filter to build and cache the query Perform multiple aggregations in a single request Adapt scoring function to current trends at query time 82
  • 83. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark AWS Redshift Data Source (Databricks) Github https://github.com/databricks/spark-redshift Maven com.databricks:spark-redshift:0.5.0 Code val df: DataFrame = sqlContext.read .format("com.databricks.spark.redshift") .option("url", "jdbc:redshift://<hostname>:<port>/<database>…") .option("query", "select x, count(*) my_table group by x") .option("tempdir", "s3n://tmpdir") .load(...) 83 UNLOAD and copy to tmp bucket in S3 enables parallel reads
  • 84. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark DB2 and BigSQL DataSources (IBM) Coming Soon! 84
  • 85. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Cassandra DataSource (DataStax) Github https://github.com/datastax/spark-cassandra-connector Maven com.datastax.spark:spark-cassandra-connector_2.10:1.5.0-M1 Code ratingsDF.write .format("org.apache.spark.sql.cassandra") .mode(SaveMode.Append) .options(Map("keyspace"->"<keyspace>", "table"->"<table>")).save(…) 85
  • 86. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Cassandra Pushdown Support spark-cassandra-connector/…/o.a.s.sql.cassandra.PredicatePushDown.scala Pushdown Predicate Rules 1. Only push down no-partition key column predicates with =, >, <, >=, <= predicate 2. Only push down primary key column predicates with = or IN predicate. 3. If there are regular columns in the pushdown predicates, they should have at least one EQ expression on an indexed column and no IN predicates. 4. All partition column predicates must be included in the predicates to be pushed down, only the last part of the partition key can be an IN predicate. For each partition column, only one predicate is allowed. 5. For cluster column predicates, only last predicate can be non-EQ predicate including IN predicate, and preceding column predicates must be EQ predicates. If there is only one cluster column predicate, the predicates could be any non-IN predicate. 6. There is no pushdown predicates if there is any OR condition or NOT IN condition. 7. We're not allowed to push down multiple predicates for the same column if any of them is equality or IN predicate. 86
  • 87. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark New Cassandra DataSource (?) By-pass CQL optimized for transactional data Instead, do bulk reads/writes directly on SSTables Similar to 5 year old Netflix Open Source project Aegisthus Promotes Cassandra to first-class Analytics Option Potentially only part of DataStax Enterprise?! Please mail a nasty letter to your local DataStax office 87
  • 88. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Rumor of REST DataSource (Databricks) Coming Soon? Ask Michael Armbrust Spark SQL Lead @ Databricks 88
  • 89. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Custom DataSource (Me and You!) Coming Right Now! 89 DEMO ALERT!!
  • 90. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Create a Custom DataSource Study Existing Native & Third-Party Data Sources Native Spark JDBC (o.a.s.sql.execution.datasources.jdbc) class JDBCRelation extends BaseRelation with PrunedFilteredScan with InsertableRelation Third-Party DataStax Cassandra (o.a.s.sql.cassandra) class CassandraSourceRelation extends BaseRelation with PrunedFilteredScan with InsertableRelation! 90
  • 91. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Demo! Create a Custom DataSource 91
  • 92. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Contribute a Custom Data Source spark-packages.org Managed by Contains links to external github projects Ratings and comments Declare supported Spark version per package Kind of like a package manager Custom Maven Repo ----> Examples https://github.com/databricks/spark-csv https://github.com/datastax/spark-cassandra-connector 92
  • 93. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Parquet Columnar File Format Based on Google Dremel Collaboration with Twitter and Cloudera Self-describing, evolving schema Fast columnar aggregation Supports filter pushdowns Columnar storage format Excellent compression 93
  • 94. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Types of Compression Run Length Encoding: Repeated data Dictionary Encoding: Fixed set of values Delta, Prefix Encoding: Sorted data 94
  • 95. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Demo! Demonstrate File Formats, Partition Schemes, and Query Plans 95
  • 96. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Hive JDBC ODBC ThriftServer Allow BI Tools to Query and Process Spark Data Register Permanent Table CREATE TABLE ratings(fromuserid INT, touserid INT, rating INT) USING org.apache.spark.sql.json OPTIONS (path "datasets/dating/ratings.json.bz2") Register Temp Table ratingsDF.registerTempTable("ratings_temp") Configuration spark.sql.thriftServer.incrementalCollect=true spark.driver.maxResultSize > 10gb (default) 96
  • 97. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Demo! Query and Process Spark Data from Beeline and/or Tableau 97
  • 98. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark More Relevant Links http://meetup.com/Advanced-Apache-Spark-Meetup http://advancedspark.com http://github.com/fluxcapacitor/pipeline http://hub.docker.com/r/fluxcapacitor/pipeline http://sortbenchmark.org/ApacheSpark2014.pd https://databricks.com/blog/2014/11/05/spark-officially-sets-a-new-record-in-large-sca le-sorting.html http://0x0fff.com/spark-architecture-shuffle/ http://www.cs.berkeley.edu/~kubitron/courses/cs262a-F13/projects/reports/project16_ report.pdf http://stackoverflow.com/questions/763262/how-does-one-write-code-that-best-utilize s-the-cpu-cache-to-improve-performance http://www.aristeia.com/TalkNotes/ACCU2011_CPUCaches.pdf http://mishadoff.com/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/ http://docs.scala-lang.org/overviews/quasiquotes/intro.html http://lwn.net/Articles/252125/ (Memory Part 2: CPU Caches) http://lwn.net/Articles/255364/ (Memory Part 5: What Programmers Can Do) https://www.safaribooksonline.com/library/view/java-performance-the/9781449363512/ ch04.html http://web.eece.maine.edu/~vweaver/projects/perf_events/perf_event_open.html http://www.brendangregg.com/perf.html https://perf.wiki.kernel.org/index.php/Tutorial http://techblog.netflix.com/2015/07/java-in-flames.html http://techblog.netflix.com/2015/04/introducing-vector-netflixs-on-host.html http://www.brendangregg.com/FlameGraphs/cpuflamegraphs.html#Java http://sortbenchmark.org/ApacheSpark2014.pdf https://databricks.com/blog/2014/11/05/spark-officially-sets-a-new-record-in-large-sca le-sorting.html http://0x0fff.com/spark-architecture-shuffle/ http://www.cs.berkeley.edu/~kubitron/courses/cs262a-F13/projects/reports/project16_ report.pdf http://stackoverflow.com/questions/763262/how-does-one-write-code-that-best-utilize s-the-cpu-cache-to-improve-performance http://www.aristeia.com/TalkNotes/ACCU2011_CPUCaches.pdf http://mishadoff.com/blog/java-magic-part-4-sun-dot-misc-dot-unsafe/ http://docs.scala-lang.org/overviews/quasiquotes/intro.html 98 http://lwn.net/Articles/252125/ <-- Memory Part 2: CPU Caches http://lwn.net/Articles/255364/ <-- Memory Part 5: What Programmers Can Do http://antirez.com/news/75 http://esumitra.github.io/algebird-boston-spark/#/ https://github.com/fluxcapacitor/pipeline http://www.cs.umd.edu/~samir/498/Amazon-Recommendations.pdf http://blog.echen.me/2011/10/24/winning-the-netflix-prize-a-summary/ http://spark.apache.org/docs/latest/ml-guide.html http://techblog.netflix.com/2012/04/netflix-recommendations-beyond-5-stars.html (part 1) http://techblog.netflix.com/2012/06/netflix-recommendations-beyond-5-stars.html (part 2) http://www.brendangregg.com/blog/2015-11-06/java-mixed-mode-flame-graphs.html
  • 99. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc What’s Next? After Dark 1.6 99
  • 100. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Incorporate New Features of Spark 1.6 https://docs.cloud.databricks.com/docs/spark/1.6/index.html 100
  • 101. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark What’s Next? Autoscaling Docker/Spark Workers Completely Docker-based Docker Compose, Google Kubernetes Lots of Demos and Examples More Zeppelin & IPython/Jupyter notebooks More advanced analytics use cases Performance Tuning and Profiling Work closely with Netflix & Databricks Identify & fix Spark performance bottlenecks 101
  • 102. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Upcoming Meetups and Conferences London Spark Meetup (Oct 12th) Scotland Data Science Meetup (Oct 13th) Dublin Spark Meetup (Oct 15th) Barcelona Spark Meetup (Oct 20th) Madrid Big Data Meetup (Oct 22nd) Paris Spark Meetup (Oct 26th) Amsterdam Spark Summit (Oct 27th) Brussels Spark Meetup (Oct 30th) Zurich Big Data Meetup (Nov 2nd) Geneva Spark Meetup (Nov 5th) San Francisco Datapalooza (Nov 10th) San Francisco Advanced Spark (Nov 12th) 102 Oslo Big Data Hadoop Meetup (Nov 19th) Helsinki Spark Meetup (Nov 20th) Stockholm Spark Meetup (Nov 23rd) Copenhagen Spark Meetup (Nov 25th) Budapest Spark Meetup (Nov 26th) Istanbul Spark Meetup (Nov 28th) Singapore Strata Conference (Dec 1st) Sydney Spark Meetup (Dec 7th) Melbourne Spark Meetup (Dec 9th) San Francisco Advanced Spark (Dec 10th) Toronto Spark Meetup (Dec 14th) Austin Data Days Conference (Jan 16th)
  • 103. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark Thank You!!! Chris Fregly IBM Spark Technology Center San Francisco, California (Find me on LinkedIn, Twitter, Github) Relevant Links advancedspark.com Signup for the book & global meetup! github.com/fluxcapacitor/pipeline Clone, contribute, and commit code! hub.docker.com/r/fluxcapacitor/pipeline/wiki Run all demos in your own environment with Docker! 103
  • 104. Power of data. Simplicity of design. Speed of innovation. IBM Spark spark.tc Power of data. Simplicity of design. Speed of innovation. IBM Spark