[TAJO-1047] DefaultTaskScheduler:allocateRackTask is failed occasionally on JDK 1.7

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.9.0
• Component/s: QueryMaster
• Assignee: Jinho Kim
• Reporter: Jinho Kim
• Created: 17/Sep/14 08:47
• Updated: 21/Sep/14 18:37
• Resolved: 20/Sep/14 08:01

Description

It is multi thread issue.

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)