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https://issues.apache.org/jira/browse/TAJO-1047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14141860#comment-14141860
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ASF GitHub Bot commented on TAJO-1047:
--------------------------------------
Github user asfgit closed the pull request at:
https://github.com/apache/tajo/pull/144
> DefaultTaskScheduler:allocateRackTask is failed occasionally on JDK 1.7
> -----------------------------------------------------------------------
>
> Key: TAJO-1047
> URL: https://issues.apache.org/jira/browse/TAJO-1047
> Project: Tajo
> Issue Type: Bug
> Components: query master
> Reporter: Jinho Kim
> Assignee: Jinho Kim
>
> It is multi thread issue.
> {noformat}
> 2014-09-03 05:17:14,378 FATAL org.apache.tajo.master.DefaultTaskScheduler:
> Comparison method violates its general contract!
> java.lang.IllegalArgumentException: Comparison method violates its general
> contract!
> at java.util.TimSort.mergeLo(TimSort.java:747)
> at java.util.TimSort.mergeAt(TimSort.java:483)
> at java.util.TimSort.mergeForceCollapse(TimSort.java:426)
> at java.util.TimSort.sort(TimSort.java:223)
> at java.util.TimSort.sort(TimSort.java:173)
> at java.util.Arrays.sort(Arrays.java:659)
> at java.util.Collections.sort(Collections.java:217)
> at
> org.apache.tajo.master.DefaultTaskScheduler$ScheduledRequests.allocateRackTask(DefaultTaskScheduler.java:678)
> at
> org.apache.tajo.master.DefaultTaskScheduler$ScheduledRequests.assignToLeafTasks(DefaultTaskScheduler.java:798)
> at
> org.apache.tajo.master.DefaultTaskScheduler.schedule(DefaultTaskScheduler.java:154)
> at
> org.apache.tajo.master.DefaultTaskScheduler$1.run(DefaultTaskScheduler.java:95)
> {noformat}
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