[jira] [Commented] (CASSANDRA-9738) Migrate key-cache to be fully off-heap

["Robert Stupp (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CASSANDRA-9738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15203267#comment-15203267 ] 

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

With CASSANDRA-11206 we eliminate a big pain (IndexInfo GC pressure and serialization).

We _could_ move the key-cache into off-heap after 11206. But it's also possible that other optimizations (CASSANDRA-8931, CASSANDRA-9754 and CASSANDRA-9786) may result in a completely different structure. Having that said, I tend to prefer at least 8931 and 9786 before tackling this one and see what the outcome of these is.

> 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.x
>
>
> 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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