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From "Jonathan Gray (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-2496) Less ArrayList churn on the scan path
Date Wed, 28 Apr 2010 17:13:48 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2496?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12861845#action_12861845
] 

Jonathan Gray commented on HBASE-2496:
--------------------------------------

Yay JD!  Great finds.  +1

> 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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