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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (CASSANDRA-4710) High key hashing overhead for index scans when using RandomPartitioner
Date Fri, 05 Oct 2012 08:26:47 GMT

     [ 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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