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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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