Talk About Apache Cassandra

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Talk About Apache Cassandra
Boris Yen
byan@ruckuswireless.com

Outline
• Overview
• Architecture Overview
• Partitioning and Replication
• Data Consistency

Overview
• Distributed
– Data partitioned among all nodes
• Extremely Scalable
– Add new node = Add more capacity
– ...

Overview
• High Performance

http://blog.cubrid.org/dev-platform/nosql-benchmarking/

• Schema-less (Not complete...

Architecture Overview
• Keyspace
– Where the replication strategy and replication factor
is defined
– RDBMS synony...

Architecture Overview
Standard CF Super CF
{ {
Key1: { Key1: ...

Architecture Overview
• Commit log
– Used to capture write activities. Data durability is
assured.
• Memtable
– Us...

Architecture Overview
• Data write path

Data Commitlog Memtable

Flushe...

Architecture Overview
• Data read path
– Search Row cache, if the result is not empty, then
return the result. No fu...

Partitioning and Replication
• In Cassandra, the total data managed by the
cluster is represented as a circular space or...

Partitioning

“boris” is inserted here

Data...

Partitioning Strategies
• Random Partitioning
– This is the default and recommended strategy.
Partition data as even...

Setting up data Partitioning
• The data partitioning strategy is controlled via
the partitioner option inside cassandra....

Replication
• To ensure fault tolerance and no single point of
failure, you can replicate one or more copies of
every ...

Replication
RF=3

“b...

Replication Strategies
• Simple Strategy
– Place the original row on a node determined by the
partitioner. Additiona...

$Replication - Network Topology Strategy RF={DC1:2, DC2:2} http://www.datastax.com/docs/1.0/cluster_architect...$

Replication Mechanics
• Cassandra uses a snitch to define how nodes
are grouped together within the overall
network to...

Replication Mechanics - Snitches
• Simple Snitch
– The default and used for simple replication strategy
• Rack Inferrin...

Data Consistency
• Cassandra supports tunable data consistency
• Choose from strong and eventual consistency
depending o...

Consistency Level for Writes
• Any
– A write must succeed on any available node (hint included)
• One
– A write must...

Consistency Level for Reads
• One
– Reads from the closest node holding the data
• Quorum
– Returns a result from a ...

Built-in Consistency Repair Features
• Read Repair
– When a read is done, the coordinator node
compares the data fro...

What is New in 1.0
• Column Family Compression
– 2x-4x reduction in data size
– 25-35% performance improvement on read...

What is New in 1.0
• Cassandra Windows Service
• Improved Write Consistency and Performance
– Hint data is stored more e...

Anti-Patterns
• Non-Sun JVM
• CommitLog+Data on the same Disk
– Does not apply to SSDs or EC2
• Oversized JVM heaps
– ...

Anti-Patterns
• Large batch mutations
– Timeout => entire mutation must be retried =>
wasted work
– Keep the batch...

Anti-Patterns
• Super Column
– 10-15 percent performance penalty on reads and
writes
– Easier/Better to use to com...

Want to Learn More
• http://www.datastax.com/resources/tutorials
• http://www.datastax.com/docs/1.0/index

P.S...

Q&A

We are hiring people
• If you are interesting in what we are doing,
please contact us.

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