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https://issues.apache.org/jira/browse/CASSANDRA-4710?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13470100#comment-13470100
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Sylvain Lebresne commented on CASSANDRA-4710:
---------------------------------------------
I agree, good catch. I went ahead a committed the fix (with some comment) in
commit 2a91a48. Thanks Yuki.
> High key hashing overhead for index scans when using RandomPartitioner
> ----------------------------------------------------------------------
>
> Key: CASSANDRA-4710
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4710
> Project: Cassandra
> Issue Type: Improvement
> Reporter: Daniel Norberg
> Assignee: Daniel Norberg
> Priority: Minor
> Fix For: 1.2.0 beta 2
>
> Attachments:
> 0001-SSTableReader-compare-raw-key-when-scanning-index.patch
>
>
> For a workload where the dataset is completely in ram, the md5 hashing of the
> keys during index scans becomes a bottleneck for reads when using
> RandomPartitioner, according to profiling.
> Instead performing a raw key equals check in SSTableReader.getPosition() for
> EQ operations improves throughput by some 30% for my workload (moving the
> bottleneck elsewhere).
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