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https://issues.apache.org/jira/browse/CASSANDRA-9738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14708431#comment-14708431
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Robert Stupp commented on CASSANDRA-9738:
-----------------------------------------
Branch is ready for another review round.
It's rebased against current 3.0 and trunk.
Changes are:
* updated to ohc 0.4.2 (to get rid of {{ByteBuffer.order()}} calls and the
try-finally-clauses)
* no more duplicate serialization effort in {{serializedSize()}} +
{{serialize()}} - uses a thread-local serialization buffer. Can be further
improved with CASSANDRA-9929.
* added/moved string serialization methods to {{ByteBufferUtil}}, which has
distinct code paths for 7-bit ASCII and strings with wider chars
> 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 beta 2
>
>
> 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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