Chris Burroughs created CASSANDRA-9872:
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Summary: 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
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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