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https://issues.apache.org/jira/browse/MAPREDUCE-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12768130#action_12768130
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Hadoop QA commented on MAPREDUCE-1089:
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+1 overall. Here are the results of testing the latest attachment
http://issues.apache.org/jira/secure/attachment/12421790/mapreduce-1089.txt
against trunk revision 827884.
+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 applied patch does not increase the total number of javac
compiler warnings.
+1 findbugs. The patch does not introduce any new Findbugs warnings.
+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 passed contrib unit tests.
Test results:
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/testReport/
Findbugs warnings:
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/artifact/trunk/build/test/findbugs/newPatchFindbugsWarnings.html
Checkstyle results:
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/artifact/trunk/build/test/checkstyle-errors.html
Console output:
http://hudson.zones.apache.org/hudson/job/Mapreduce-Patch-h6.grid.sp2.yahoo.net/196/console
This message is automatically generated.
> Fair Scheduler preemption triggers NPE when tasks are scheduled but not
> running
> -------------------------------------------------------------------------------
>
> Key: MAPREDUCE-1089
> URL: https://issues.apache.org/jira/browse/MAPREDUCE-1089
> Project: Hadoop Map/Reduce
> Issue Type: Bug
> Components: contrib/fair-share
> Affects Versions: 0.21.0
> Reporter: Todd Lipcon
> Assignee: Todd Lipcon
> Attachments: mapreduce-1089.txt
>
>
> We see exceptions like this when preemption runs when a task has been
> scheduled on a TT but has not yet started running.
> 2009-10-09 14:30:53,989 INFO org.apache.hadoop.mapred.FairScheduler: Should
> preempt 2 MAP tasks for job_200910091420_0006: tasksDueToMinShare = 2,
> tasksDueToFairShare = 0
> 2009-10-09 14:30:54,036 ERROR org.apache.hadoop.mapred.FairScheduler:
> Exception in fair scheduler UpdateThread
> java.lang.NullPointerException
> at
> org.apache.hadoop.mapred.FairScheduler$2.compare(FairScheduler.java:1015)
> at
> org.apache.hadoop.mapred.FairScheduler$2.compare(FairScheduler.java:1013)
> at java.util.Arrays.mergeSort(Arrays.java:1270)
> at java.util.Arrays.sort(Arrays.java:1210)
> at java.util.Collections.sort(Collections.java:159)
> at
> org.apache.hadoop.mapred.FairScheduler.preemptTasks(FairScheduler.java:1013)
> at
> org.apache.hadoop.mapred.FairScheduler.preemptTasksIfNecessary(FairScheduler.java:911)
> at
> org.apache.hadoop.mapred.FairScheduler$UpdateThread.run(FairScheduler.java:286)
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