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https://issues.apache.org/jira/browse/CASSANDRA-5389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13630281#comment-13630281
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Ahmed Bashir commented on CASSANDRA-5389:
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How does this effect the overall memory footprint on the heap?

                
> 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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