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From "Eldon Stegall (JIRA)" <j...@apache.org>
Subject [jira] Created: (CASSANDRA-2331) Allow a Job Configuration to control the consistency level with which reads and writes occur for mapreduce jobs.
Date Tue, 15 Mar 2011 16:49:29 GMT
Allow a Job Configuration to control the consistency level with which reads and writes occur
for mapreduce jobs.
----------------------------------------------------------------------------------------------------------------

                 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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