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Sam Tunnicliffe commented on CASSANDRA-11593:
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+1, that's definitely a big improvement. I think we should also target 3.0.x,
which requires a few small mods to the patch but nothing significant.
> getFunctions methods produce too much garbage
> ---------------------------------------------
>
> Key: CASSANDRA-11593
> URL: https://issues.apache.org/jira/browse/CASSANDRA-11593
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Benjamin Lerer
> Assignee: Benjamin Lerer
> Fix For: 3.x
>
>
> While profiling an heavy write workload on a single machine, I discover that
> calls to {{getFunctions}} were producing a lot of garbage.
> Internally, the getFunctions method use {{Iterators}} or {{Iterables}}
> functions that creates new immutable collections at each level.
> As {{getFunctions}} is called for each SELECT, INSERT, UPDATE or DELETE
> through the {{checkAccess}} method the impact is not neglectable.
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