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From "Pavel Yaskevich (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-6689) Partially Off Heap Memtables
Date Sat, 22 Mar 2014 00:32:45 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-6689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13943787#comment-13943787
] 

Pavel Yaskevich commented on CASSANDRA-6689:
--------------------------------------------

One more thing I forgot to mention which is for consideration, we might take advantage of
SlabAllocator (on-heap) to accommodate all of the temporary buffers created by copying from
Memtable so when that allocation spills to oldgen it would create less fragmentation in there.

> Partially Off Heap Memtables
> ----------------------------
>
>                 Key: CASSANDRA-6689
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-6689
>             Project: Cassandra
>          Issue Type: New Feature
>          Components: Core
>            Reporter: Benedict
>            Assignee: Benedict
>              Labels: performance
>             Fix For: 2.1 beta2
>
>         Attachments: CASSANDRA-6689-final-changes.patch, CASSANDRA-6689-small-changes.patch
>
>
> Move the contents of ByteBuffers off-heap for records written to a memtable.
> (See comments for details)



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