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https://issues.apache.org/jira/browse/HBASE-16960?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15615377#comment-15615377
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Yu Li commented on HBASE-16960:
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bq. So this exception not null check was/is intended to check for the case of
DamagedWALException
Not exactly. It may also throw exception in
{{FSWALEntry#stampRegionSequenceId}} and actually some
{{UnsupportedOperationException}} in {{CellUtil#setSequenceId}}, when trying to
set sequenceId in non SettableSequenceId cells.
But yes, in real world I think the {{DamagedWALException}} is most case.
> RegionServer hang when aborting
> -------------------------------
>
> Key: HBASE-16960
> URL: https://issues.apache.org/jira/browse/HBASE-16960
> Project: HBase
> Issue Type: Bug
> Reporter: binlijin
> Assignee: binlijin
> Attachments: HBASE-16960.patch, 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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