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https://issues.apache.org/jira/browse/CASSANDRA-9738?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14735342#comment-14735342
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Benedict commented on CASSANDRA-9738:
-------------------------------------
It can actually be faster to compare the exact class instance, as this is
pretty well optimised by hotspot (and should just involve comparing the object
headers). It is unlikely to make _much_ of a difference here, especially with
the shallow class hierarchy here, just noting it.
In this case it looks like for correctness in the {{RowIndexEntry}} class it
needs to be an exact match anyway though.
The IndexedEntry doesn't need to duplicate those checks though, since they're
performed by the call to RIE.equals
> 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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