PySpark
found IT project #9
@

▸ facebook : Ryuji Tamagawa
▸ Twitter : tamagawa_ryuji
▸ FB
found IT project
▸ Twitter

11

Wes Mckinney blog
▸ http://qiita.com/tamagawa-ryuji

▸
▸
▸ Spark Hadoop
▸ PySpark
▸ Spark/Hadoop PyData

▸
▸
▸

PySpark
▸
▸ SSD
▸ CPU
▸
Parquet
S3
CPU

https://www.slideshare.net/kumagi/ss-78765920/4

▸
▸
▸ groupby
▸ Spark API

Spark Hadoop

Spark Hadoop
Hadoop0.x Spark
OS
HDFS
MapReduce
OS
HDFS
Hive e.t.c.
HBase
MapReduce
OS
HDFS
Hive e.t.c.
HBaseMapReduce
YARN
Spark
Spark Streaming, MLlib,
GraphX, Spark SQL)
Impala
SQL
YARN
Spark
Spark Streaming, MLlib, GraphX,
Spark SQL)
Mesos
Spark
Spark Streaming, MLlib, GraphX,
Spark SQL) Spark
Spark Streaming, MLlib, GraphX,
Spark SQL)
Windows
Hadoop 0.x Hadoop 1.x Hadoop 2.x + Spark

▸ Amazon EMR
▸ Microsoft Azure HDInsight
▸ Cloudera Altus
▸ Databricks Community Edition Spark
▸ PyData + Jupyter PySpark

Spark Hadoop
Hadoop Spark
map
JVM
HDFS
reduce
JVM
map
JVM
reduce
JVM
f1
RDD
Executor JVM
HDFS
f2
f3
f4
f5
f6
f7
MapReduce Spark
RDD

Spark Hadoop
Spark
▸ Hadoop MapReduce
▸ Spark API MapReduce API
▸ Hadoop

PySpark
(Py)Spark
▸ / Spark
▸ PyData
▸ Spark
▸ Spark Hadoop
PyData
PySpark

Spark 1.2
PySpark …
(Py)Spark

PySpark

PySpark
RDD API DataFrame API
▸ RDD Resilient Distributed Dataset =
Spark Java
▸ DataFrame RDD
/ R data.frame
▸ Python RDD API DataFrame API Scala
/ Java

PySpark
DataFrame API
RDD
DataFrame /
Dataset
MLlib ML
GraphX GraphFrame
Spark
Streaming
Structured
Streaming

Worker node
PySpark
Executer
JVM
Driver
JVM
Executer
JVM
Executer
JVM
Storage
Python
VM
Worker node Worker node
Python
VM
Python
VM
RDD API PySpark
Worker node
Executer
JVM
Driver
JVM
Executer
JVM
Executer
JVM
Storage
Python
VM
Worker node Worker node
Python
VM
Python
VM
DataFrame API PySpark

PySpark
▸ RDD API Executer JVM Python VM
▸ DataFrame API JVM
▸ UDF Python VM
▸ UDF Scala Java
▸ Spark 2.x DataFrame

Spark PyData

Spark PyData
Spark PyData
▸ Spark
▸ Python PyData
▸
▸ Parquet
▸ Apache Arrow

Spark PyData
▸ CSV JSON
▸Parquet Spark DataFrame API
Python
fastparquet pyarrow
▸ Performance comparison of different file formats and storage engines
in the Hadoop ecosystem
▸
=

Spark PyData
Parquet
https://parquet.apache.org/documentation/latest/
zip CSV
I/O
ROW BLOCK
COLUMN #0 ROW #0
COLUMN #0 ROW #1
COLUMN #0 ROW #N
COLUMN #1 ROW #0
COLUMN #1 ROW #1
…
…
COLUMN #1 ROW #N
COLUMN #2 ROW #0
COLUMN #2 ROW #1
…
COLUMN #M ROW #N
ROW BLOCK
COLUMN #0 ROW #0
COLUMN #0 ROW #1
COLUMN #0 ROW #N
COLUMN #1 ROW #0
COLUMN #1 ROW #1
…
…
COLUMN #1 ROW #N
COLUMN #2 ROW #0
COLUMN #2 ROW #1
…
COLUMN #M ROW #N
...

Spark PyData
Spark
df = spark.read.csv(csvFilename, header=True, schema = theSchema).coalesce(20)
df.write.save(filename, compression = 'snappy')
from fastparquet import write
pdf = pd.read_csv(csvFilename)
write(filename, pdf, compression='UNCOMPRESSED')
fastparquet
import pyarrow as pa
import pyarrow.parquet as pq
arrow_table = pa.Table.from_pandas(pdf)
pq.write_table(arrow_table, filename, compression = 'GZIP')
pyarrow

Spark PyData
▸ pandas CSV Spark
Spark pandas
…
▸ Spark - pandas
▸ pandas → Spark …
▸ Apache Arrow

Spark PyData
Apache Arrow
▸ Apache Arrow
▸ PyData / OSS
▸ /
https://arrow.apache.org

Spark PyData
Wes blog
▸ pandas Apache Arrow
▸ Blog
▸ PyData Blog
Wes OK
▸ Apache Arrow pandas 10
https://qiita.com/tamagawa-ryuji/items/3d8fc52406706ae0c144

PySpark

11