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Robert Stupp commented on CASSANDRA-9738:
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bq. consider pushing this back
Also +1.
The major open tasks are to eliminate the need to copy the RIE on cache-get,
which requires bullet-proof ref-counting, and double buffering during RIE
building, which is sometimes just a waste of CPU/heap as the returned RIE
object is never used.
> 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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