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From "Robert Stupp (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-9738) Migrate key-cache to be fully off-heap
Date Wed, 10 Feb 2016 13:33:18 GMT


Robert Stupp commented on CASSANDRA-9738:

Yes, it is.
Just want to get the current UDF/UDA stuff done before.
Generally, I'd like to see what's coming with CASSANDRA-9754. The current "problem" is the
amount of off-heap serializations for big partitions as we do a binary search for the lookup.
If that gets better with CASSANDRA-9754, that would be great.
We can optimize the whole path with CASSANDRA-8931 and CASSANDRA-9786. If these give promising
results, a follow-up _might_ be to merge the summary into index-info.

> 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.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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