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https://issues.apache.org/jira/browse/MAPREDUCE-2116?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13000789#comment-13000789
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Hadoop QA commented on MAPREDUCE-2116:
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-1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12472135/2116.5.patch
against trunk revision 1075670.
+1 @author. The patch does not contain any @author tags.
-1 tests included. The patch doesn't appear to include any new or modified
tests.
Please justify why no new tests are needed for this
patch.
Also please list what manual steps were performed to
verify this patch.
+1 javadoc. The javadoc tool did not generate any warning messages.
-1 javac. The patch appears to cause tar ant target to fail.
-1 findbugs. The patch appears to cause Findbugs (version 1.3.9) to fail.
+1 release audit. The applied patch does not increase the total number of
release audit warnings.
+1 core tests. The patch passed core unit tests.
-1 contrib tests. The patch failed contrib unit tests.
+1 system test framework. The patch passed system test framework compile.
Test results:
https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/104//testReport/
Console output:
https://hudson.apache.org/hudson/job/PreCommit-MAPREDUCE-Build/104//console
This message is automatically generated.
> optimize getTasksToKill to reduce JobTracker contention
> -------------------------------------------------------
>
> Key: MAPREDUCE-2116
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-2116
> Project: Hadoop Map/Reduce
> Issue Type: Improvement
> Components: jobtracker
> Reporter: Joydeep Sen Sarma
> Assignee: Joydeep Sen Sarma
> Attachments: 2116.1.patch, 2116.2.patch, 2116.3.patch, 2116.4.patch,
> 2116.5.patch, getTaskToKill.JPG
>
>
> getTasksToKill shows up as one of the top routines holding the JT lock.
> Specifically, the translation from attemptid to tip is very expensive:
> at java.util.TreeMap.getEntry(TreeMap.java:328)
> at java.util.TreeMap.get(TreeMap.java:255)
> at
> org.apache.hadoop.mapred.TaskInProgress.shouldClose(TaskInProgress.java:500)
> at
> org.apache.hadoop.mapred.JobTracker.getTasksToKill(JobTracker.java:3464)
> locked <0x00002aab6ebb6640> (a org.apache.hadoop.mapred.JobTracker)
> at org.apache.hadoop.mapred.JobTracker.heartbeat(JobTracker.java:3181)
> this seems like an avoidable expense since the tip for a given attempt is
> fixed (and one should not need a map lookup to find the association). on a
> different note - not clear to me why TreeMaps are in use here (i didn't find
> any iteration over these maps). any background info on why things are
> arranged the way they are would be useful.
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