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From "Bryan Duxbury (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2600) [hbase] Performance: HStore.getRowKeyAtOrBefore should use MapFile.Reader#getClosest (before)
Date Wed, 16 Jan 2008 01:37:35 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Bryan Duxbury updated HADOOP-2600:

    Status: Patch Available  (was: Open)

Trying Hudson

> [hbase] Performance: HStore.getRowKeyAtOrBefore should use MapFile.Reader#getClosest
> ---------------------------------------------------------------------------------------------
>                 Key: HADOOP-2600
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2600
>             Project: Hadoop
>          Issue Type: Improvement
>          Components: contrib/hbase
>            Reporter: Bryan Duxbury
>            Assignee: Bryan Duxbury
>            Priority: Minor
>         Attachments: 2600.patch
> Once HADOOP-2532 is committed, we should make use of the new MapFile method to improve
the performance of getClosestRow. This is an important improvement, because this method is
used to look up region locations, a very critical part of HBase. Currently, the needed behavior
is simulated by doing a linear scan of the MapFile. I think that 2532 will allow us to replace
this with an index based lookup, which should make it much faster.

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