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https://issues.apache.org/jira/browse/METRON-820?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15953962#comment-15953962
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ASF GitHub Bot commented on METRON-820:
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Github user ottobackwards commented on the issue:
https://github.com/apache/incubator-metron/pull/508
+1 by inspection, although I'm inclined to think of a reason not to have a
static cache, but instead an instance based one, I can't think of a specific
case.
> 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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