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Dinesh Joshi commented on CASSANDRA-15657:
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Committed, your patch in
[trunk|https://github.com/apache/cassandra/commit/b05fe7ab010218f1fb23b3192e2aea719a9611de].
Awaiting +1 for the [dtest
change|https://github.com/apache/cassandra-dtest/compare/master...dineshjoshi:15657?expand=1].
> Improve zero-copy-streaming containment check by using file sections
> --------------------------------------------------------------------
>
> Key: CASSANDRA-15657
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15657
> Project: Cassandra
> Issue Type: Improvement
> Components: Legacy/Streaming and Messaging
> Reporter: ZhaoYang
> Assignee: ZhaoYang
> Priority: Normal
> Fix For: 4.0
>
>
> Currently zero copy streaming is only enabled for leveled-compaction strategy
> and it checks if all keys in the sstables are included in the transferred
> ranges.
> This is very inefficient. The containment check can be improved by checking
> if transferred sections (the transferred file positions) cover entire sstable.
> I also enabled ZCS for all compaction strategies since the new containment
> check is very fast..
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