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Posted to commits@cassandra.apache.org by "Jonathan Ellis (JIRA)" <ji...@apache.org> on 2013/09/20 23:40:53 UTC

[jira] [Resolved] (CASSANDRA-4105) Use WritableComparable / Writable in RecordReader

     [ https://issues.apache.org/jira/browse/CASSANDRA-4105?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jonathan Ellis resolved CASSANDRA-4105.
---------------------------------------

    Resolution: Won't Fix
    
> Use WritableComparable / Writable in RecordReader
> -------------------------------------------------
>
>                 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, 1.2.0 beta 1
>            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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