Adam Fuchs created ACCUMULO-599:
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Summary: investigate permgen collection and class unloading with
concurrent mark and sweep garbage collector
Key: ACCUMULO-599
URL: https://issues.apache.org/jira/browse/ACCUMULO-599
Project: Accumulo
Issue Type: Bug
Components: scripts
Affects Versions: 1.3.6, 1.4.0
Reporter: Adam Fuchs
Assignee: John Vines
The Java concurrent mark and sweep garbage collector appears to default to not
unloading classes or sweeping the permgen storage space. Accumulo reloads
classes dynamically, potentially contributing a lot to the permgen space. It is
important that these classes be garbage collected when we're done with them.
Since we use -XX:+UseConcMarkSweepGC by default for all Accumulo processes,
should we also use -XX:+CMSClassUnloadingEnabled and
-XX:+CMSPermGenSweepingEnabled? Are there other flags or parameters that we
should set to really do java garbage collection properly in a long-lived
instance?
These should be set in conf/accumulo-env.sh as part of ACCUMULO_GENERAL_OPTS.
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