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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Resolved: (HBASE-2496) Less ArrayList churn on the scan path
Date Wed, 28 Apr 2010 18:02:08 GMT

     [ https://issues.apache.org/jira/browse/HBASE-2496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Jean-Daniel Cryans resolved HBASE-2496.

    Hadoop Flags: [Reviewed]
      Resolution: Fixed

Committed to branch and trunk (and I added some more finals in ColumnCount). Thanks for reviewing

> Less ArrayList churn on the scan path
> -------------------------------------
>                 Key: HBASE-2496
>                 URL: https://issues.apache.org/jira/browse/HBASE-2496
>             Project: Hadoop HBase
>          Issue Type: Improvement
>    Affects Versions: 0.20.3
>            Reporter: Jean-Daniel Cryans
>            Assignee: Jean-Daniel Cryans
>             Fix For: 0.20.5, 0.21.0
>         Attachments: HBASE-2496.patch
> Doing some profiling when testing the scanning speed of 0.20.4, I saw that we are spending
a lot of time instantiating ArrayLists when scanning and that we could sometime set the right
size of the arrays. I don't expect big improvements for short scans, but people like us who
are scanning in batches of 10k could get some nice speedups.

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