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https://issues.apache.org/jira/browse/HBASE-1253?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12680709#action_12680709
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Evgeny Ryabitskiy commented on HBASE-1253:
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I think everything is ok. This AbstaractScaner used only for one family, so
there no need to have Map of Vectors that will contain only one Vector.
You can also try to rollback changes and monitor in debug value of
okCols.size(). It is always 1.
> 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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