Fair Scheduler preemption triggers NPE when tasks are scheduled but not running
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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
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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