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https://issues.apache.org/jira/browse/CASSANDRA-15516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17020950#comment-17020950
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Benedict Elliott Smith commented on CASSANDRA-15516:
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For those interested, a performance comparison of this work against 3.0 can be
found on CASSANDRA-15511, which builds on this patch to be able to remove the
partition lock.
> Failed partition updates should not consume memtable space
> ----------------------------------------------------------
>
> Key: CASSANDRA-15516
> URL: https://issues.apache.org/jira/browse/CASSANDRA-15516
> Project: Cassandra
> Issue Type: Improvement
> Components: Local/Memtable
> Reporter: Benedict Elliott Smith
> Priority: Normal
>
> Moving my proposed patch for CASSANDRA-15367 here. Contended memtable
> updates currently waste memtable memory each time they fail to apply. This
> patch avoids this problem by ensuring we only copy data once onto the
> memtable, and reconcile this new data for all future attempts to insert.
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