[jira] [Created] (HBASE-12856) Revisit table coprocessor classloader caching

["Andrew Purtell (JIRA)" <ji...@apache.org>]

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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