Use WritableComparable / Writable in RecordReader
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Key: CASSANDRA-4105
URL: https://issues.apache.org/jira/browse/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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