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https://issues.apache.org/jira/browse/HBASE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13768420#comment-13768420
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stack commented on HBASE-9480:
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[~fenghh] Sounds great. Make new issue and we'll pile on.
> 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
> Fix For: 0.98.0, 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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