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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-1253) Remove unnecessary, expensive column matcher lookup
Date Tue, 10 Mar 2009 20:54:50 GMT

     [ https://issues.apache.org/jira/browse/HBASE-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

stack updated HBASE-1253:
-------------------------

    Attachment: 1253.patch

Purge map. Just use Vector of matchers (Vector should probably be purged since Vector is synchronized
and I don't think it needs be).

> Remove unnecessary, expensive column matcher lookup
> ---------------------------------------------------
>
>                 Key: HBASE-1253
>                 URL: https://issues.apache.org/jira/browse/HBASE-1253
>             Project: Hadoop HBase
>          Issue Type: Improvement
>            Reporter: stack
>             Fix For: 0.19.1
>
>         Attachments: 1253.patch
>
>
> We do lots of matching on columns.  We have different kinds of matchers dependent on
how the scanner was configured.  Down in HAS, we have a map of family name to its matchers.
 There is no need of the Map since column matching is done at the family/store context only.
 Removing should save on some unnecessary CPU (I saw up to 10% in simple seek+scan test --
so hopefully this comes down to 5 or 4%).

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