[Coprocessors] Implement child failure strategies for external coprocessor host
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Key: HBASE-5047
URL: https://issues.apache.org/jira/browse/HBASE-5047
Project: HBase
Issue Type: Sub-task
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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