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https://issues.apache.org/jira/browse/CASSANDRA-11593?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15247365#comment-15247365
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Benjamin Lerer commented on CASSANDRA-11593:
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|[trunk|https://github.com/blerer/cassandra/tree/11593-trunk]|[utest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-11593-trunk-testall/2/]|[dtest|http://cassci.datastax.com/view/Dev/view/blerer/job/blerer-11593-trunk-dtest/2/]|
The patch use some collecting parameter to limit the creation of objects.
> 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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