[HBASE-9481] Servershutdown handler get aborted with ConcurrentModificationException

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.96.0
• Fix Version/s: 0.96.0
• Component/s: MTTR
• Assignee: Jeffrey Zhong
• Reporter: Jeffrey Zhong
• Created: 09/Sep/13 23:59
• Updated: 20/Nov/15 11:55
• Resolved: 10/Sep/13 18:23

Description

In integration tests, we found SSH got aborted with following stack trace:

13/09/07 18:10:00 ERROR executor.EventHandler: Caught throwable while processing event M_SERVER_SHUTDOWN
java.util.ConcurrentModificationException
        at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
        at java.util.HashMap$ValueIterator.next(HashMap.java:822)
        at org.apache.hadoop.hbase.master.RegionStates.serverOffline(RegionStates.java:378)
        at org.apache.hadoop.hbase.master.AssignmentManager.processServerShutdown(AssignmentManager.java:3143)
        at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.process(ServerShutdownHandler.java:207)
        at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:131)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:662)