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Posted to mapreduce-issues@hadoop.apache.org by "Hudson (Commented) (JIRA)" <ji...@apache.org> on 2011/10/01 03:08:45 UTC
[jira] [Commented] (MAPREDUCE-2779) JobSplitWriter.java can't
handle large job.split file
[ https://issues.apache.org/jira/browse/MAPREDUCE-2779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13118612#comment-13118612 ]
Hudson commented on MAPREDUCE-2779:
-----------------------------------
Integrated in Hadoop-Mapreduce-22-branch #79 (See [https://builds.apache.org/job/Hadoop-Mapreduce-22-branch/79/])
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=1177787
Files :
* /hadoop/common/branches/branch-0.22/mapreduce/CHANGES.txt
* /hadoop/common/branches/branch-0.22/mapreduce/src/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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