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Posted to common-dev@hadoop.apache.org by "Sidharth Gupta (JIRA)" <ji...@apache.org> on 2009/04/06 20:00:14 UTC

[jira] Created: (HADOOP-5630) Adding Multiple Reducers implementations.

Adding Multiple Reducers implementations.
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                 Key: HADOOP-5630
                 URL: https://issues.apache.org/jira/browse/HADOOP-5630
             Project: Hadoop Core
          Issue Type: New Feature
            Reporter: Sidharth Gupta


Like the Patch released here https://issues.apache.org/jira/browse/HADOOP-372 can we have a multi format Reducer too. Someone suggested that if we need different reducers and map implementations(like what i need) I was better of by writing 2 jobs. I dont quite agree. I am calculating 2 big matrices that must be calculated in the map step, summed in the reducers multiplied and then written to a file. The First mapper sums a matrix  based on the i,j th index(key) into the file and the second mapper adds the N*1  dimension vector that uses a new line as key. These keys must be passed as such to the reduce process.

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