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https://issues.apache.org/jira/browse/HBASE-16960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15614234#comment-15614234
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binlijin commented on HBASE-16960:
----------------------------------
The problem can happen when:
（1）FSHLog#rollWriter throw exception and LogRoller call regionserver.abort
（2）RingBufferEventHandler.onEvent process FSWALEntry throw DamagedWALException
（3）RingBufferEventHandler.onEvent process safe point, set
RingBufferEventHandler.exception=null
（4）RingBufferEventHandler.onEvent process SyncFuture (MemStoreFlusher.1
FSHLog.sync) endOfBatch=false
（5）RingBufferEventHandler.onEvent process FSWALEntry (ASYNC_WAL FSHLog.append)
There is no other events, so the MemStoreFlusher.1 FSHLog.sync will hang.
> RegionServer hang when aborting
> -------------------------------
>
> Key: HBASE-16960
> URL: https://issues.apache.org/jira/browse/HBASE-16960
> Project: HBase
> Issue Type: Bug
> Reporter: binlijin
> Attachments: RingBufferEventHandler.png,
> RingBufferEventHandler_exception.png, SyncFuture.png,
> SyncFuture_exception.png, rs1081.jstack
>
>
> We see regionserver hang when aborting several times and cause all regions on
> this regionserver out of service and then all affected applications stop
> works.
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