The document discusses using Apache Cassandra for end-to-end analytics. It provides an overview of Cassandra's capabilities for analytics like Pig and Hive integration, and recommends use cases like trends analysis, data problem detection, and backpopulating historical data. It also provides tips on data modeling, output formats, and integrating Cassandra with tools like Oozie, Pig, and Hadoop distributions.

1. End-to-end Analytics
with Apache Cassandra
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2. Basics
• CFIF/CFOF/CFRR/CFRW
• BulkOutputFormat
• Input locality (identical to HDFS)
• Wide row, 2I, composite support
• Pig, Hive, Mahout, Sqoop, Oozie, DSE
Analytics
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3. Why Cassandra?
• Excellent Hadoop capabilities built-in
• Multi-datacenter support, load isolation
• Operationally, order of magnitude simpler
• DSE Analytics is all-in-one, simpler still
• Review your requirements, do homework
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4. Use Cases
• Trends, recommendations, reporting, etc.
• Detect and fix problems in data
• New realtime (or analytic) query pattern?
• Backpopulate new CF with historical data
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5. Data Model
• Consider growth patterns and analytic
query patterns for your data
• One-off inquiry or regular processing?
• Fast growing, want only small slices?
• Consider active/archive CFs
• Secondary indexes for small inputs
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6. Miscellaneous Tips
• Don’t forget about tombstones
• BOP to enable range slices (Rows with
keys ‘A*’ to ‘F*’)
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7. Cassandra + Oozie
• Workflows: cohesive, nestable, scheduled
• Web UI, CLI, web service
• Cassandra properties in oozie job
properties, and workflow.xml
• Writing out to Cassandra:
mapreduce.fileoutputcommitter.marksuccessfuljobs to false
• DSE Analytics works with Oozie 3.2.1+
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8. Cassandra + Pig
• Data with validators
• Pig tuples (address.name, address.value)
• Data with default validator
• Bag of key, value pairs (tuples)
• Unmarshal with Pygmalion
• Select by regex (eg ‘1369*’, ‘link*’)
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9. Cassandra + Pig
• Output to Cassandra
• Can output directly with (key, (name,
value), (name, value)...) format
• For tabular data, format output with
Pygmalion’s ToCassandraBag
• Use BulkOutputFormat (C* 1.1)
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10. Cassandra + Pig
• Composite column support (C* 1.0.9+)
• Counter support (C* 1.0.9+)
• Secondary Index support for relatively
small slices (C* 1.1+)
• Wide row support (C* 1.1+)
• Composite key support (C* 1.1.3+)
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11. Cassandra + Hadoop X
• Example: Cassandra + CDH3
• Start with Cassandra ring
• Add NN, JT, Oozie server
• TaskTracker, DataNode on each node
• Jobs/launching point have Cassandra info
• Segregate out analytics with virtual DC
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12. Current/Future Work
• Cassandra core Hive support (outside of
Brisk) (CASSANDRA-4131)
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13. For More Information
• Follow @CassandraHadoop on Twitter
• http://wiki.apache.org/cassandra/
HadoopSupport
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14. Questions?
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