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https://issues.apache.org/jira/browse/HBASE-5047?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13170513#comment-13170513
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Andrew Purtell commented on HBASE-5047:
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Is it sufficient to consider children that crashed as permanently stuck?
> [Coprocessors] Implement child failure strategies for external coprocessor
> host
> -------------------------------------------------------------------------------
>
> Key: HBASE-5047
> URL: https://issues.apache.org/jira/browse/HBASE-5047
> Project: HBase
> Issue Type: Sub-task
> Components: coprocessors
> Reporter: Andrew Purtell
>
> There should be three selectable strategies:
> 1. Close and reopen the region, triggering force termination of the stuck
> child on close, and fork/initialization of a new child on open, along with
> reinit of all region related resources, other coprocessors, etc.
> 2. Unload/reload the malfunctioning coprocessor. Will require some work in
> the coprocessor framework to actually support unloading in a reasonable way.
> The JVM may make this complicated for integrated CPs, so perhaps just for
> those hosted in external processes.
> 3. Unload/terminate the malfunctioning coprocessor and continue operation.
> Consider changes in the CP framework for temporary blacklisting, will need
> that to avoid loading the suspect CP after a split.
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