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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MAPREDUCE-2779) JobSplitWriter.java can't handle large job.split file
Date Sat, 01 Oct 2011 13:35:34 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118807#comment-13118807
] 

Hudson commented on MAPREDUCE-2779:
-----------------------------------

Integrated in Hadoop-Hdfs-0.23-Build #26 (See [https://builds.apache.org/job/Hadoop-Hdfs-0.23-Build/26/])
    MAPREDUCE-2779. JobSplitWriter.java can't handle large job.split file. Contributed by
Ming Ma.

shv : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1177783
Files : 
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/CHANGES.txt
* /hadoop/common/branches/branch-0.23/hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core/src/main/java/org/apache/hadoop/mapreduce/split/JobSplitWriter.java

                
> JobSplitWriter.java can't handle large job.split file
> -----------------------------------------------------
>
>                 Key: MAPREDUCE-2779
>                 URL: https://issues.apache.org/jira/browse/MAPREDUCE-2779
>             Project: Hadoop Map/Reduce
>          Issue Type: Bug
>          Components: job submission
>    Affects Versions: 0.20.205.0, 0.22.0, 0.23.0
>            Reporter: Ming Ma
>            Assignee: Ming Ma
>             Fix For: 0.22.0, 0.23.0, 0.24.0
>
>         Attachments: MAPREDUCE-2779-0.22.patch, MAPREDUCE-2779-trunk.patch, MAPREDUCE-2779-trunk.patch
>
>
> We use cascading MultiInputFormat. MultiInputFormat sometimes generates big job.split
used internally by hadoop, sometimes it can go beyond 2GB.
> In JobSplitWriter.java, the function that generates such file uses 32bit signed integer
to compute offset into job.split.
> writeNewSplits
> ...
>         int prevCount = out.size();
> ...
>         int currCount = out.size();
> writeOldSplits
> ...
>       long offset = out.size();
> ...
>       int currLen = out.size();

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