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https://issues.apache.org/jira/browse/METRON-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956861#comment-15956861
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ASF GitHub Bot commented on METRON-820:
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Github user cestella commented on the issue:
https://github.com/apache/incubator-metron/pull/508
None other than the fact that we might have an empty guava cache hanging
around in memory. At the moment, nobody uses the alternative cache.
> StellarProcessor should have a static expression cache
> ------------------------------------------------------
>
> Key: METRON-820
> URL: https://issues.apache.org/jira/browse/METRON-820
> Project: Metron
> Issue Type: Bug
> Reporter: Casey Stella
>
> We recreate StellarProcessor objects all over the place which do not reuse
> their expression caches. This results in a significant performance
> regression as we are compiling the expression and then processing for every
> message, rather than compiling once and reusing.
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