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Posted to commits@cassandra.apache.org by "Benedict (JIRA)" <ji...@apache.org> on 2015/03/05 14:20:39 UTC

[jira] [Created] (CASSANDRA-8918) Optimise compaction performance for unique partition keys

Benedict created CASSANDRA-8918:
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             Summary: Optimise compaction performance for unique partition keys
                 Key: CASSANDRA-8918
                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8918
             Project: Cassandra
          Issue Type: Improvement
          Components: Core
            Reporter: Benedict
             Fix For: 3.0


Related to the raft of improvements we're looking at for improving the CPU burden of merge, if we can demonstrate that an entire partition key is unique to a given file (which is quite easily done) we can avoid materialising any of the row, and simply copy the data wholesale, with potentially some small modifications to the index file data if it has clustering column index entries, and special treatment of tombstones (most simple would be to only check there are no tombstones to purge, and abort this approach if so).



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