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https://issues.apache.org/jira/browse/CASSANDRA-5389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630291#comment-13630291
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Jonathan Ellis commented on CASSANDRA-5389:
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It's basically negligible since all of these are going to be swept out during
young gen compaction, they'll never get tenured.
The more important effect is that adding sorted entries to a TreeMap one at a
time is the worst-case scenario for that Collection and can burn a lot of CPU
rebalancing.
> Deserialize to arrays instead of trees
> --------------------------------------
>
> Key: CASSANDRA-5389
> URL: https://issues.apache.org/jira/browse/CASSANDRA-5389
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Reporter: Jonathan Ellis
> Assignee: Jonathan Ellis
> Priority: Minor
> Fix For: 2.0
>
> Attachments: 5389.txt
>
>
> As near as I can tell, there's no reason to deserialize CFs to trees anymore.
> On the write path, we move it into an Atomic collection in the Memtable; on
> the read path, we also create a new clone when merging different results.
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