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Date: Tue, 10 Mar 2009 16:32:50 -0700 (PDT)
From: "Evgeny Ryabitskiy (JIRA)" <jira@apache.org>
To: hbase-dev@hadoop.apache.org
Subject: [jira] Commented: (HBASE-1253) Remove unnecessary, expensive column
 matcher lookup
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    [ https://issues.apache.org/jira/browse/HBASE-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680691#action_12680691 ] 

Evgeny Ryabitskiy commented on HBASE-1253:
------------------------------------------

Comment here have to be fixed according changes:

  // Holds matchers for each column family.  Its keyed by the byte [] hashcode
  // which you can get by calling Bytes.mapKey.
  private Vector<ColumnMatcher> matchers = new Vector<ColumnMatcher>();
  

> 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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