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From "Devaraj Das (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-9480) Regions are unexpectedly made offline in certain failure conditions
Date Mon, 09 Sep 2013 23:48:51 GMT
Devaraj Das created HBASE-9480:
----------------------------------

             Summary: 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: Critical


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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