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From "Patrik Modesto (Created) (JIRA)" <>
Subject [jira] [Created] (CASSANDRA-4105) Use WritableComparable / Writable in RecordReader
Date Fri, 30 Mar 2012 07:30:38 GMT
Use WritableComparable / Writable in RecordReader

                 Key: CASSANDRA-4105
             Project: Cassandra
          Issue Type: Wish
          Components: Hadoop
    Affects Versions: 0.8.11, 1.0.9, 1.1.1, 1.2
            Reporter: Patrik Modesto

Cassandra uses ByteByffer/List<Mutation> as key/value in RecordWriter. This prevents
the use of MultipleOutputs class that requires a key to be WritableComparable and value to
be Writable. MultipleOutputs is a very handy class that provides a way to write to several
differrent OutputFormats from a reducer. In our case I have a mapreduce job that produces
two results which I need to write to Cassandra and to a file respectively and as for now I
need to run that mapreduce twice which is quite expensive.

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