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Posted to mapreduce-issues@hadoop.apache.org by "Eli Collins (JIRA)" <ji...@apache.org> on 2011/08/11 20:10:31 UTC

[jira] [Moved] (MAPREDUCE-2811) Adding Multiple Reducers implementations.

     [ https://issues.apache.org/jira/browse/MAPREDUCE-2811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eli Collins moved HADOOP-5630 to MAPREDUCE-2811:
------------------------------------------------

        Key: MAPREDUCE-2811  (was: HADOOP-5630)
    Project: Hadoop Map/Reduce  (was: Hadoop Common)

> Adding Multiple Reducers implementations.
> -----------------------------------------
>
>                 Key: MAPREDUCE-2811
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2811
>             Project: Hadoop Map/Reduce
>          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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