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Date: Tue, 4 Aug 2015 19:21:05 +0000 (UTC)
From: "Robert Stupp (JIRA)" <jira@apache.org>
To: commits@cassandra.apache.org
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Subject: [jira] [Commented] (CASSANDRA-9738) Migrate key-cache to be fully
 off-heap
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    [ https://issues.apache.org/jira/browse/CASSANDRA-9738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14654195#comment-14654195 ] 

Robert Stupp commented on CASSANDRA-9738:
-----------------------------------------

FTR: I've added a chunked implementation to OHC but it is not included in this ticket. A thorough review of that chunked implementation would be required. The chunked impl has the advantage to reduce malloc/free-rate to nearly 0 at the cost that the key-cache cannot be resized dynamically (at least yet).

> Migrate key-cache to be fully off-heap
> --------------------------------------
>
>                 Key: CASSANDRA-9738
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9738
>             Project: Cassandra
>          Issue Type: Sub-task
>            Reporter: Robert Stupp
>            Assignee: Robert Stupp
>             Fix For: 3.0.0 rc1
>
>
> Key cache still uses a concurrent map on-heap. This could go to off-heap and feels doable now after CASSANDRA-8099.
> Evaluation should be done in advance based on a POC to prove that pure off-heap counter cache buys a performance and/or gc-pressure improvement.
> In theory, elimination of on-heap management of the map should buy us some benefit.


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