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https://issues.apache.org/jira/browse/MAPREDUCE-4229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13461297#comment-13461297
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Hadoop QA commented on MAPREDUCE-4229:
--------------------------------------
+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12546184/MAPREDUCE-4229.patch
against trunk revision .
+1 @author. The patch does not contain any @author tags.
+1 tests included. The patch appears to include 3 new or modified test
files.
+1 javac. The applied patch does not increase the total number of javac
compiler warnings.
+1 javadoc. The javadoc tool did not generate any warning messages.
+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
hadoop-common-project/hadoop-common
hadoop-mapreduce-project/hadoop-mapreduce-client/hadoop-mapreduce-client-core.
+1 contrib tests. The patch passed contrib unit tests.
Test results:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2869//testReport/
Console output:
https://builds.apache.org/job/PreCommit-MAPREDUCE-Build/2869//console
This message is automatically generated.
> Intern counter names in the JT
> ------------------------------
>
> Key: MAPREDUCE-4229
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-4229
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Affects Versions: 1.0.2
> Reporter: Todd Lipcon
> Attachments: MAPREDUCE-4229.patch
>
>
> In our experience, most of the memory in production JTs goes to storing
> counter names (String objects and character arrays). Since most counter names
> are reused again and again, it would be a big memory savings to keep a hash
> set of already-used counter names within a job, and refer to the same object
> from all tasks.
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