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https://issues.apache.org/jira/browse/MAPREDUCE-1750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12863252#action_12863252
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Adam Kramer commented on MAPREDUCE-1750:
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Sorry for being unclear. Yes, this is for streaming. I agree that that is a
good first step.
And yes, I meant the number of values, not the number of keys. Thanks!
> Make #rows avail. to reducers as environment variable
> -----------------------------------------------------
>
> Key: MAPREDUCE-1750
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1750
> Project: Hadoop Map/Reduce
> Issue Type: Wish
> Reporter: Adam Kramer
> Priority: Minor
>
> Given that there is a sort phase between the copy phase and the reduce phase,
> it seems like there is a chance for counting during sort.
> It would be nice if my reducers could have access to an environment variable,
> say, mapred.reduce.rows, that contained the number of rows present for this
> reducer (as counted during the sort step).
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