An introduction to Apache Cassandra

1
Apache Cassandra

• What is it ?
• How does it work ?
• Hadoop
• Tools
• Architecture

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Cassandra What is it ?

• Distributed database management system
• Designed for big data
• Scalable
• Fault tolerant
• No single point of failure
• Has an SQL like query language
• NoSQL

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3
Cassandra How does it work ?

• Organises data into tables
• Uses Cassandra Query Language ( CQL )?
• Does not allow sub queries or joins
• Supports Hadoop Map Reduce
• Uses asynchronous masterless replication
• Gives low latency
• Allows indexing
• Allows batch analysis via Hadoop

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4
Cassandra Hadoop

• How does Cassandra integrate with Hadoop
• Support for Map Reduce
• Integration with
• Apache Pig
• Apache Hive
• Can also act as a back end for Solr !

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5
Cassandra Tools

• User Interface ( GUI )
• Cassandra GUI
• Toad for cloud db's
• Administration
• OpsCentre
• Cassandra Cluster Admin
• Other
• Client libraries
• Java, Python, .Net, Perl etc

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6
Cassandra Architecture

• A peer to peer cluster
• No single point of failure
• Tunable consistency
• Is performance or accuracy more important ?
• Query by key or key range
• Row oriented data storage
• Rows can hold up to 2 billion columns

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7
Cassandra Architecture
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8
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