Andrew Purtell created HBASE-12856:
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Summary: Revisit table coprocessor classloader caching
Key: HBASE-12856
URL: https://issues.apache.org/jira/browse/HBASE-12856
Project: HBase
Issue Type: Improvement
Reporter: Andrew Purtell
For table coprocessors, we create coprocessor classloaders and cache them keyed
on the path to the coprocessor jar. However, we cache weak refs so it's quite
possible if the refs are not being retained due to heap pressure we might
create a new classloader on the next region open, i.e. after a split or
relocation. If under very heavy write load, perhaps ingest with all edits
skipping the WAL for example, we'd be both generating a ton of garbage and
rapidly splitting at the same time.
We should revisit the notion of keeping only weak refs.
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