Allow a Job Configuration to control the consistency level with which reads and
writes occur for mapreduce jobs.
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Key: CASSANDRA-2331
URL: https://issues.apache.org/jira/browse/CASSANDRA-2331
Project: Cassandra
Issue Type: Improvement
Components: Hadoop
Reporter: Eldon Stegall
Priority: Minor
Attachments: consistencylevelpatch.txt
Allow a Job Configuration to control the consistency level with which reads and
writes occur for mapreduce jobs. This would be useful if we were doing
statistical rollups and wanted to fail if consistency isn't met (W + R <= N as
described by http://wiki.apache.org/cassandra/ArchitectureOverview). An example
of a situation where this might happen would be if a set of cassandra nodes
became partitioned from the other nodes, but were still accepting some writes
with ConsistencyLevel 1/2 (in the case that writes were local to the
partition). Then statistical rollup jobs might succeed without those accepted
writes being included, and this would not be desirable.
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