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From "Robert Stupp (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9738) Migrate key-cache to be fully off-heap
Date Tue, 04 Aug 2015 21:29:04 GMT


Robert Stupp commented on CASSANDRA-9738:

[~kohlisankalp] all previous tests were "plain old simple stress" profiles - so no big partitions.
The [current|] and next cstar tests have
different stress profiles with different partition sizes. I appreciate suggestions for real-world
stress profiles.
But even if this gives no throughput benefit, reduced GC pressure (or not letting objects
"escape" from new-gen) is worth the change.

> Migrate key-cache to be fully off-heap
> --------------------------------------
>                 Key: CASSANDRA-9738
>                 URL:
>             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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