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Posted to mapreduce-issues@hadoop.apache.org by "Jaden Park (JIRA)" <ji...@apache.org> on 2014/10/20 20:39:34 UTC

[jira] [Commented] (MAPREDUCE-6108) ShuffleError OOM while reserving memory by MergeManagerImpl

    [ https://issues.apache.org/jira/browse/MAPREDUCE-6108?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14177272#comment-14177272 ] 

Jaden Park commented on MAPREDUCE-6108:
---------------------------------------

I am still not clear on why we resort to (usedMemory > memoryLimit) instead of (usedMemory + requestedSize > memoryLimit). How exactly do all fetchers stall, and is there no resolution we could prevent it? 

> ShuffleError OOM while reserving memory by MergeManagerImpl
> -----------------------------------------------------------
>
>                 Key: MAPREDUCE-6108
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-6108
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>    Affects Versions: 2.5.1
>            Reporter: Dongwook Kwon
>            Priority: Critical
>
> Shuffle has OOM issue from time to time.  
> Such as this email reported.
> http://mail-archives.apache.org/mod_mbox/hadoop-mapreduce-dev/201408.mbox/%3CCABWXXjNK-on0XTrMuriJD8SDGJjTAMSvQW2CZpm3oEkJ3YM8YQ@mail.gmail.com%3E



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