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From "Hudson (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-4539) OpenedRegionHandler racing with itself in ServerShutDownhandler flow leading to HMaster abort
Date Sun, 09 Oct 2011 10:10:30 GMT

    [ https://issues.apache.org/jira/browse/HBASE-4539?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13123657#comment-13123657
] 

Hudson commented on HBASE-4539:
-------------------------------

Integrated in HBase-0.92 #54 (See [https://builds.apache.org/job/HBase-0.92/54/])
    HBASE-4540 OpenedRegionHandler is not enforcing atomicity of the operation it is performing.
 Also addresses HBASE-4539. (Ram)

ramkrishna : 
Files : 
* /hbase/branches/0.92/CHANGES.txt
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/master/AssignmentManager.java
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/master/handler/OpenedRegionHandler.java
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKAssign.java
* /hbase/branches/0.92/src/main/java/org/apache/hadoop/hbase/zookeeper/ZKUtil.java
* /hbase/branches/0.92/src/test/java/org/apache/hadoop/hbase/master/TestOpenedRegionHandler.java

                
> OpenedRegionHandler racing with itself in ServerShutDownhandler flow leading to HMaster
abort
> ---------------------------------------------------------------------------------------------
>
>                 Key: HBASE-4539
>                 URL: https://issues.apache.org/jira/browse/HBASE-4539
>             Project: HBase
>          Issue Type: Bug
>            Reporter: ramkrishna.s.vasudevan
>            Assignee: ramkrishna.s.vasudevan
>
> Steps to reproduce
> ==================
> -> Region R1 is being opened in RS1.  
> ->After processing the znode to OPENED RS1 goes down.
> ->Now before the OpenedRegionHandler executor deletes the znode if ServerShutDownHandler
tries to assign the region to RS2, RS2 transits the node to OPENED and this OpenedRegionHandler
executor deletes the znode.  
> ->Now if the first OpenedRegionHandler tries deleting the znode it throws NoNode Exception
and causes the HMaster to abort.

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