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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
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Evgeny Ryabitskiy commented on HBASE-1253:
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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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