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From "Matei Zaharia (JIRA)" <j...@apache.org>
Subject [jira] Commented: (MAPREDUCE-1089) Fair Scheduler preemption triggers NPE when tasks are scheduled but not running
Date Thu, 29 Oct 2009 00:50:59 GMT

    [ https://issues.apache.org/jira/browse/MAPREDUCE-1089?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771225#action_12771225

Matei Zaharia commented on MAPREDUCE-1089:

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

> 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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