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https://issues.apache.org/jira/browse/MAPREDUCE-2811?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Eli Collins moved HADOOP-5630 to MAPREDUCE-2811:
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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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