[TAJO-295] ConcurrentModificationException in TaskScheduler

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.2-incubating
• Fix Version/s: 0.8.0
• Component/s: QueryMaster
• Assignee: Jinho Kim
• Reporter: Jinho Kim
• Created: 31/Oct/13 11:15
• Updated: 01/Nov/13 03:08
• Resolved: 01/Nov/13 02:26

Description

TaskSchedulerImpl.java throws ConcurrentModificationException while assigning task.

2013-10-31 14:29:04,411 INFO  querymaster.Query (Query.java:handle(447)) - Processing q_1383197276362_0001 of type INIT_COMPLETED
Exception in thread "Thread-23" 2013-10-31 14:29:04,536 INFO  event.TaskS
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
        at java.util.HashMap$KeyIterator.next(HashMap.java:828)
        at org.apache.tajo.master.TaskSchedulerImpl$ScheduledRequests.assignToNonLeafTasks(TaskSchedulerImpl.java:505)
        at org.apache.tajo.master.TaskSchedulerImpl.schedule(TaskSchedulerImpl.java:201)