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Posted to commits@cassandra.apache.org by "Tyler Hobbs (JIRA)" <ji...@apache.org> on 2016/07/08 17:45:11 UTC

[jira] [Created] (CASSANDRA-12153) RestrictionSet.hasIN() is slow

Tyler Hobbs created CASSANDRA-12153:
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             Summary: RestrictionSet.hasIN() is slow
                 Key: CASSANDRA-12153
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-12153
             Project: Cassandra
          Issue Type: Improvement
          Components: Coordination
            Reporter: Tyler Hobbs
            Assignee: Tyler Hobbs
            Priority: Minor
             Fix For: 3.x


While profiling local in-memory reads for CASSANDRA-10993, I noticed that {{RestrictionSet.hasIN()}} was responsible for about 1% of the time.  It looks like it's mostly slow because it creates a new LinkedHashSet (which is expensive to init) and uses streams.  This can be replaced with a simple for loop.



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