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Date: Thu, 12 Sep 2013 21:50:54 +0000 (UTC)
From: "Jimmy Xiang (JIRA)" <jira@apache.org>
To: issues@hbase.apache.org
Message-ID: <JIRA.12667699.1378770432503.125704.1379022653999@arcas>
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Subject: [jira] [Updated] (HBASE-9480) Regions are unexpectedly made offline
 in certain failure conditions
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     [ 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_v2.patch

Attached v2, now the test should not be flaky any more.
                
> 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
>            Assignee: Jimmy Xiang
>            Priority: Blocker
>             Fix For: 0.96.0
>
>         Attachments: 9480-1.txt, trunk-9480.patch, trunk-9480_v1.1.patch, trunk-9480_v1.2.patch, trunk-9480_v2.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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