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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