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https://issues.apache.org/jira/browse/MAPREDUCE-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771225#action_12771225
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Matei Zaharia commented on MAPREDUCE-1089:
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Hey Todd,
I was going to commit your patch, but I'm getting a lot of fair scheduler test
failures even without the patch due to "java.lang.RuntimeException: No queues
defined" when initializing the JobTracker. I will wait until whoever broke this
fixes it. Do you have any idea what patch caused this? I remember seeing a JIRA
about this no queues issue before, but I can't find it.
> 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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