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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-5186) mapreduce.job.max.split.locations causes some splits created by CombineFileInputFormat to fail
Date Thu, 24 Oct 2013 22:24:02 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-5186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13804754#comment-13804754
] 

Karthik Kambatla commented on MAPREDUCE-5186:
---------------------------------------------

I think the first patch is closer to what we might want. Comments on that patch:
# Warning alone should be enough, can get rid of Arrays.copyOf statements.
# The test checking the exception can be dropped. Instead manually verifying the WARN message
should be good enough.

> 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: job submission
>    Affects Versions: 2.0.4-alpha, 2.2.0
>            Reporter: Sangjin Lee
>            Assignee: Robert Parker
>            Priority: Critical
>         Attachments: MAPREDUCE-5186v1.patch, MAPREDUCE-5186v2.patch
>
>
> 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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