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https://issues.apache.org/jira/browse/HBASE-10119?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13844972#comment-13844972
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Lars Hofhansl commented on HBASE-10119:
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The new behavior is less surprising than the old. So +1 for 0.94
> Allow HBase coprocessors to clean up when they fail
> ---------------------------------------------------
>
> Key: HBASE-10119
> URL: https://issues.apache.org/jira/browse/HBASE-10119
> Project: HBase
> Issue Type: New Feature
> Affects Versions: 0.96.0
> Reporter: Benoit Sigoure
> Assignee: Benoit Sigoure
> Fix For: 0.98.0, 0.96.1, 0.99.0
>
> Attachments: HBASE-10119-0.94.patch, HBASE-10119.patch
>
>
> In the thread [Giving a chance to buggy coprocessors to clean
> up|http://osdir.com/ml/general/2013-12/msg17334.html] I brought up the issue
> that coprocessors currently don't have a chance to release their own
> resources (be they internal resources within the JVM, or external resources
> elsewhere) when they get forcefully removed due to an uncaught exception
> escaping.
> It would be nice to fix that, either by adding an API called by the
> {{CoprocessorHost}} when killing a faulty coprocessor, or by guaranteeing
> that the coprocessor's {{stop()}} method will be invoked then.
> This feature request is actually pretty important due to bug HBASE-9046,
> which means that it's not possible to properly clean up a coprocessor without
> restarting the RegionServer (!!).
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