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https://issues.apache.org/jira/browse/HBASE-11444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14049164#comment-14049164
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Andrew Purtell commented on HBASE-11444:
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As an alternative half-measure, I wonder if we can cache the resolved
implementation class and method handles after the first lookup.
> Remove use of reflection in the User facade
> -------------------------------------------
>
> Key: HBASE-11444
> URL: https://issues.apache.org/jira/browse/HBASE-11444
> Project: HBase
> Issue Type: Improvement
> Reporter: Andrew Purtell
> Fix For: 0.99.0
>
>
> The time we spend looking up a user's short name with User#getShortName in
> hot security code paths is mostly spent in Class#getMethod, ~70%. This is
> only ~1% of overall CPU time but is the bulk of time spent in
> AccessController#prePut, for example.
> Since HBase 1.0 is only going to support Hadoop 2, we can remove the use of
> reflection and replace with direct calls to UserGroupInformation, or remove
> the User facade and use UGI directly.
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