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https://issues.apache.org/jira/browse/HBASE-4014?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13052691#comment-13052691
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Andrew Purtell commented on HBASE-4014:
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We just need a concurrent update safe {{Set<? extends Coprocessor>}} in the
global scope of the regionserver and master that gets updated whenever a
CoprocessorHost is created during HRegion load.
There is no need to worry about removing listed CPs if all tables for which a
CP was loaded are disabled or if all relevant regions move off a RegionServer;
currently once a CP is loaded the classes remain resident in the JVM even if no
active instances. (Class unloading is tricky. We've decided to not do it for
CPs unless there is a compelling reason.)
> Coprocessors: Flag the presence of coprocessors in logged exceptions
> --------------------------------------------------------------------
>
> Key: HBASE-4014
> URL: https://issues.apache.org/jira/browse/HBASE-4014
> Project: HBase
> Issue Type: Improvement
> Components: coprocessors
> Reporter: Andrew Purtell
>
> For some initial triage of bug reports for core versus for deployments with
> loaded coprocessors, we need something like the Linux kernel's taint flag,
> and list of linked in modules that show up in the output of every OOPS, to
> appear above or below exceptions that appear in the logs.
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