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https://issues.apache.org/jira/browse/HBASE-9480?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13764844#comment-13764844
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Jeffrey Zhong commented on HBASE-9480:
--------------------------------------
The region isn't there could be the case that a region is in transition(or
move). There are some time widow that a region is closed at the hosting
RS(znode isn't deleted because the region is about to open in a different RS)
and before the znode state changes to offline, the current retry loop or the
timing we send the CLOSE RPC could still let us hit the origin code path.
> 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
>
>
> 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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