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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12167) NPE in AssignmentManager
Date Fri, 03 Oct 2014 17:06:34 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12167?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14158199#comment-14158199
] 

Jimmy Xiang commented on HBASE-12167:
-------------------------------------

SSH  catches it and reprocess the dead server. In SSH, we tried to wait for an extra regionserver.
But it is not reliable since the extra regionserver could die after SSH thinks the extra server
is there. So it is possible for this NPE and it is rare. Reprocessing the dead server should
help.

> NPE in AssignmentManager
> ------------------------
>
>                 Key: HBASE-12167
>                 URL: https://issues.apache.org/jira/browse/HBASE-12167
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Jimmy Xiang
>            Assignee: Jimmy Xiang
>             Fix For: 2.0.0, 0.99.1
>
>         Attachments: hbase-12167.patch
>
>
> If we can't find a region plan, we should check.
> {noformat}
> 2014-10-02 18:36:27,719 ERROR [MASTER_SERVER_OPERATIONS-a2424:20020-0] executor.EventHandler:
Caught throwable while processing event M_SERVER_SHUTDOWN
> java.lang.NullPointerException
>         at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1417)
>         at org.apache.hadoop.hbase.master.AssignmentManager.assign(AssignmentManager.java:1409)
>         at org.apache.hadoop.hbase.master.handler.ServerShutdownHandler.process(ServerShutdownHandler.java:271)
>         at org.apache.hadoop.hbase.executor.EventHandler.run(EventHandler.java:128)
>         at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
>         at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
>         at java.lang.Thread.run(Thread.java:724)
> {noformat}



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