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From "Jason Brown (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-6609) Reduce Bloom Filter Garbage Allocation
Date Wed, 22 Jan 2014 19:49:24 GMT


Jason Brown commented on CASSANDRA-6609:

Doh! Too much c coding these days :)

> Reduce Bloom Filter Garbage Allocation
> --------------------------------------
>                 Key: CASSANDRA-6609
>                 URL:
>             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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