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Posted to mapreduce-issues@hadoop.apache.org by "Hadoop QA (Commented) (JIRA)" <ji...@apache.org> on 2011/12/21 02:13:30 UTC
[jira] [Commented] (MAPREDUCE-3567) Extraneous JobConf objects in
AM heap
[ https://issues.apache.org/jira/browse/MAPREDUCE-3567?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13173719#comment-13173719 ]
Hadoop QA commented on MAPREDUCE-3567:
--------------------------------------
-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12507601/MAPREDUCE-3567-20111215.1.txt
against trunk revision .
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 9 new or modified tests.
+1 javadoc. The javadoc tool did not generate any warning messages.
-1 javac. The applied patch generated 2320 javac compiler warnings (more than the trunk's current 2308 warnings).
+1 eclipse:eclipse. The patch built with eclipse:eclipse.
+1 findbugs. The patch does not introduce any new Findbugs (version 1.3.9) warnings.
+1 release audit. The applied patch does not increase the total number of release audit warnings.
+1 core tests. The patch passed unit tests in .
+1 contrib tests. The patch passed contrib unit tests.
Test results: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1485//testReport/
Console output: https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/1485//console
This message is automatically generated.
> Extraneous JobConf objects in AM heap
> -------------------------------------
>
> Key: MAPREDUCE-3567
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-3567
> Project: Hadoop Map/Reduce
> Issue Type: Sub-task
> Components: mr-am, mrv2, performance
> Affects Versions: 0.23.0
> Reporter: Vinod Kumar Vavilapalli
> Assignee: Vinod Kumar Vavilapalli
> Fix For: 0.23.1
>
> Attachments: MAPREDUCE-3567-20111215.1.txt
>
>
> MR AM creates new JobConf objects unnecessarily in a couple of places in JobImpl and TaskImpl which occupy non-trivial amount of heap.
> While working with a 64 bit JVM on 100K maps jobs, with uncompressed pointers, removing those extraneous objects helped in addressing OOM with 2GB AM heap size.
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