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https://issues.apache.org/jira/browse/CASSANDRA-4710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel Norberg updated CASSANDRA-4710:
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Attachment: (was:
0001-SSTableReader-compare-raw-key-when-scanning-index.patch)
> 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: Bug
> Reporter: Daniel Norberg
> 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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