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Posted to commits@cassandra.apache.org by "Sylvain Lebresne (JIRA)" <ji...@apache.org> on 2012/10/05 10:26:47 UTC
[jira] [Resolved] (CASSANDRA-4710) High key hashing overhead for
index scans when using RandomPartitioner
[ https://issues.apache.org/jira/browse/CASSANDRA-4710?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Sylvain Lebresne resolved CASSANDRA-4710.
-----------------------------------------
Resolution: Fixed
> 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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