[jira] [Created] (HBASE-13418) Regions getting stuck in PENDING_CLOSE state infinitely

["Vikas Vishwakarma (JIRA)" <ji...@apache.org>]

Vikas Vishwakarma created HBASE-13418:
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             Summary: Regions getting stuck in PENDING_CLOSE state infinitely
                 Key: HBASE-13418
                 URL: https://issues.apache.org/jira/browse/HBASE-13418
             Project: HBase
          Issue Type: Bug
    Affects Versions: 0.98.10
            Reporter: Vikas Vishwakarma


In some heavy data load cases when there are multiple RegionServers going up/down (HA) or when we try to shutdown/restart the entire HBase cluster, we are observing that some regions are getting stuck in PENDING_CLOSE state infinitely. 

On going through the logs for a particular region stuck in PENDING_CLOSE state, it looks like for this region two memstore flush got triggered within few milliseconds as given below and after sometime there is Unrecoverable exception while closing region. I am suspecting this could be some kind of race condition but need to check further

Logs:
================
......
2015-04-06 11:47:33,309 INFO  [2,queue=0,port=60020] regionserver.HRegionServer - Close 884fd5819112370d9a9834895b0ec19c, via zk=yes, znode version=0, on blitzhbase01-dnds1-4-crd.eng.sfdc.net,60020,1428318111711
2015-04-06 11:47:33,309 DEBUG [-dnds3-4-crd:60020-0] handler.CloseRegionHandler - Processing close of RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c.
2015-04-06 11:47:33,319 DEBUG [-dnds3-4-crd:60020-0] regionserver.HRegion - Closing RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c.: disabling compactions & flushes
2015-04-06 11:47:33,319 INFO  [-dnds3-4-crd:60020-0] regionserver.HRegion - Running close preflush of RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c.
2015-04-06 11:47:33,319 INFO  [-dnds3-4-crd:60020-0] regionserver.HRegion - Started memstore flush for RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c., current region memstore size 70.0 M
2015-04-06 11:47:33,327 DEBUG [-dnds3-4-crd:60020-0] regionserver.HRegion - Updates disabled for region RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c.
2015-04-06 11:47:33,328 INFO  [-dnds3-4-crd:60020-0] regionserver.HRegion - Started memstore flush for RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c., current region memstore size 70.0 M
2015-04-06 11:47:33,328 WARN  [-dnds3-4-crd:60020-0] wal.FSHLog - Couldn't find oldest seqNum for the region we are about to flush: [884fd5819112370d9a9834895b0ec19c]
2015-04-06 11:47:33,328 WARN  [-dnds3-4-crd:60020-0] regionserver.MemStore - Snapshot called again without clearing previous. Doing nothing. Another ongoing flush or did we fail last attempt?
2015-04-06 11:47:33,334 FATAL [-dnds3-4-crd:60020-0] regionserver.HRegionServer - ABORTING region server blitzhbase01-dnds3-4-crd.eng.sfdc.net,60020,1428318082860: Unrecoverable exception while closing region RMHA_1,\x04\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00,1428318937003.884fd5819112370d9a9834895b0ec19c., still finishing close







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