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https://issues.apache.org/jira/browse/CASSANDRA-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13975647#comment-13975647
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Sylvain Lebresne commented on CASSANDRA-6843:
---------------------------------------------

Then let's maybe wait to see how that pan out first, but using allocateMemory() 
and freeMemory() does sound like a reasonable idea to me a priori.

> Reclaim overwritten off-heap memtable space early
> -------------------------------------------------
>
>                 Key: CASSANDRA-6843
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6843
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 3.0
>
>
> Perform GC on the off-heap memtable arenas



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