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Posted to mapreduce-issues@hadoop.apache.org by "Akira AJISAKA (JIRA)" <ji...@apache.org> on 2015/05/08 06:03:00 UTC

[jira] [Commented] (MAPREDUCE-3384) Add warning message for org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer

    [ https://issues.apache.org/jira/browse/MAPREDUCE-3384?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14533820#comment-14533820 ] 

Akira AJISAKA commented on MAPREDUCE-3384:
------------------------------------------

I'm thinking adding warning message only in org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer is inconsistent. We need to add warning messages in the following classes as well.
* org.apache.hadoop.mapred.lib.LongSumReducer
* org.apache.hadoop.mapreduce.lib.reduce.IntSumReducer


> Add warning message for org.apache.hadoop.mapreduce.lib.reduce.LongSumReducer
> -----------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-3384
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-3384
>             Project: Hadoop Map/Reduce
>          Issue Type: Improvement
>            Reporter: JiangKai
>            Priority: Minor
>              Labels: BB2015-05-TBR
>         Attachments: MAPREDUCE-3384.patch
>
>
> When we call the function reduce() of LongSumReducer,the result may overflow.
> We should send a warning message to users if overflow occurs.



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