[HBASE-5047] [Coprocessors] Implement child failure strategies for external coprocessor host

• Type: Sub-task
• Status: Closed
• Priority: Major
• Resolution: Won't Fix
• Component/s: Coprocessors
• Assignee: Unassigned
• Reporter: Andrew Kyle Purtell
• Created: 15/Dec/11 21:42
• Updated: 12/Jun/22 19:58
• Resolved: 12/Jun/22 19:58

Description

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.