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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Created: (HBASE-1253) Remove unnecessary, expensive column matcher lookup
Date Tue, 10 Mar 2009 20:52:50 GMT
Remove unnecessary, expensive column matcher lookup
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                 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


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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