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https://issues.apache.org/jira/browse/CASSANDRA-8918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14348989#comment-14348989
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Jonathan Ellis commented on CASSANDRA-8918:
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Can we get around (2) by materializing extra stats per-partition?
> 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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