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https://issues.apache.org/jira/browse/CASSANDRA-6609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13879094#comment-13879094
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Jason Brown commented on CASSANDRA-6609:
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Doh! Too much c coding these days :)
> Reduce Bloom Filter Garbage Allocation
> --------------------------------------
>
> Key: CASSANDRA-6609
> URL: https://issues.apache.org/jira/browse/CASSANDRA-6609
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Benedict
> Attachments: tmp.diff
>
>
> Just spotted that we allocate potentially large amounts of garbage on bloom
> filter lookups, since we allocate a new long[] for each hash() and to store
> the bucket indexes we visit, in a manner that guarantees they are allocated
> on heap. With a lot of sstables and many requests, this could easily be
> hundreds of megabytes of young gen churn per second.
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