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https://issues.apache.org/jira/browse/CASSANDRA-9872?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chris Burroughs updated CASSANDRA-9872:
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Attachment: j9872-2.0-v1.txt
> only check KeyCache when it is enabled
> --------------------------------------
>
> Key: CASSANDRA-9872
> URL: https://issues.apache.org/jira/browse/CASSANDRA-9872
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Chris Burroughs
> Assignee: Chris Burroughs
> Labels: cache, metrics
> Attachments: j9872-2.0-v1.txt
>
>
> If the KeyCache exists (because at least one column family is using it) we
> currenlty check the key cache even for requests to column families where the
> key cache is disabled. I think it would be better to only check the cache if
> entries *could* be there.
> * This will align the key cache with how the row cache behaves.
> * This makes the key cache metrics much more useful. For example,
> 'requests' becomes 'requests to things that could be in the key cache' and
> not just 'total requests'.
> * This migh be a micro-optimization saving a few metric update.
> only count 'hit-able' requests as key cache misses
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