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https://issues.apache.org/jira/browse/HBASE-11444?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14055341#comment-14055341
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Gary Helmling commented on HBASE-11444:
---------------------------------------
Did you intend to remove the caching of the previously resolved short name as
well?
{noformat}
- if (shortName != null) return shortName;
{noformat}
This was there because the UserGroupInformation implementation of it, which
iterates the Subject's principals to return it, had shown up as having a
surprisingly measurable impact in profiling of AccessController.
> Remove use of reflection for User#getShortName
> ----------------------------------------------
>
> Key: HBASE-11444
> URL: https://issues.apache.org/jira/browse/HBASE-11444
> Project: HBase
> Issue Type: Improvement
> Affects Versions: 0.98.3
> Reporter: Andrew Purtell
> Assignee: Andrew Purtell
> Fix For: 0.99.0, 0.98.4
>
> Attachments: HBASE-11444.patch, IntegrationTestIngestWithACL.get.svg,
> IntegrationTestIngestWithACL.put.svg
>
>
> 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.
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