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From "Raymond Liu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-7952) Remove update() and Improve ExplicitColumnTracker performance.
Date Wed, 27 Feb 2013 07:55:12 GMT
Raymond Liu created HBASE-7952:
----------------------------------

             Summary: Remove update() and Improve ExplicitColumnTracker performance.
                 Key: HBASE-7952
                 URL: https://issues.apache.org/jira/browse/HBASE-7952
             Project: HBase
          Issue Type: Improvement
          Components: regionserver
    Affects Versions: 0.94.5, 0.94.1
            Reporter: Raymond Liu
            Assignee: Raymond Liu
             Fix For: 0.96.0


In ColumnTracker.java, the update() method is not used by anyone now. And no one will call
checkColumn for different HFiles with update() in between files to re-walk through the target
columns. All columns will be feed to checkColumn() in order.

So, within ExplicitColumnTracker, the target columns can be optimized to not dynamic maintain
a changing list of columns yet to match. Instead, just move index through it is enough.

with this optimization to save the time for avoid reconstruct a columns array upon each row,
the checkColumn method's performance could be improved by 10-20%.

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