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Posted to mapreduce-issues@hadoop.apache.org by "Joep Rottinghuis (JIRA)" <ji...@apache.org> on 2013/09/18 00:55:52 UTC

[jira] [Commented] (MAPREDUCE-5186) mapreduce.job.max.split.locations causes some splits created by CombineFileInputFormat to fail

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13770118#comment-13770118 ] 

Joep Rottinghuis commented on MAPREDUCE-5186:
---------------------------------------------

Any inputs on this ?
                
> mapreduce.job.max.split.locations causes some splits created by CombineFileInputFormat to fail
> ----------------------------------------------------------------------------------------------
>
>                 Key: MAPREDUCE-5186
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-5186
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: mrv1, mrv2
>    Affects Versions: 2.0.4-alpha
>            Reporter: Sangjin Lee
>
> CombineFileInputFormat can easily create splits that can come from many different locations (during the last pass of creating "global" splits). However, we observe that this often runs afoul of the mapreduce.job.max.split.locations check that's done by JobSplitWriter.
> The default value for mapreduce.job.max.split.locations is 10, and with any decent size cluster, CombineFileInputFormat creates splits that are well above this limit.

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