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Posted to commits@cassandra.apache.org by "Nitsan Wakart (JIRA)" <ji...@apache.org> on 2016/03/24 10:38:25 UTC

[jira] [Created] (CASSANDRA-11422) Eliminate temporary object[] allocations in ColumnDefinition::hashCode

Nitsan Wakart created CASSANDRA-11422:
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             Summary: Eliminate temporary object[] allocations in ColumnDefinition::hashCode
                 Key: CASSANDRA-11422
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-11422
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Nitsan Wakart


ColumnDefinition::hashCode currently calls Objects.hashCode(Object...)
This triggers the allocation of a short lived Object[] which is not eliminated by EscapeAnalysis. I have implemented a fix by inlining the hashcode logic and also added a caching hashcode field. This improved performance on the read workload.
Fix is available here:
https://github.com/nitsanw/cassandra/tree/objects-hashcode-fix



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