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From "Jimmy Xiang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-9480) Regions are unexpectedly made offline in certain failure conditions
Date Wed, 11 Sep 2013 18:22:53 GMT

     [ https://issues.apache.org/jira/browse/HBASE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jimmy Xiang updated HBASE-9480:
-------------------------------

    Attachment: trunk-9480.patch

Attached a patch to make sure the znode is not deleted in this case.  RS throws a region already
in transition exception. Master moves the region to failed_to_close state once tries run out.
 The region can still be closed and reassigned if it is eventually closed.

Trying to add a test case now.
                
> Regions are unexpectedly made offline in certain failure conditions
> -------------------------------------------------------------------
>
>                 Key: HBASE-9480
>                 URL: https://issues.apache.org/jira/browse/HBASE-9480
>             Project: HBase
>          Issue Type: Bug
>            Reporter: Devaraj Das
>            Priority: Blocker
>             Fix For: 0.96.0
>
>         Attachments: 9480-1.txt, trunk-9480.patch
>
>
> Came across this issue (HBASE-9338 test):
> 1. Client issues a request to move a region from ServerA to ServerB
> 2. ServerA is compacting that region and doesn't close region immediately. In fact, it
takes a while to complete the request.
> 3. The master in the meantime, sends another close request.
> 4. ServerA sends it a NotServingRegionException
> 5. Master handles the exception, deletes the znode, and invokes regionOffline for the
said region.
> 6. ServerA fails to operate on ZK in the CloseRegionHandler since the node is deleted.
> The region is permanently offline.
> There are potentially other situations where when a RegionServer is offline and the client
asks for a region move off from that server, the master makes the region offline.

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