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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HBASE-11444) Remove use of reflection for User#getShortName
Date Fri, 04 Jul 2014 19:05:34 GMT

     [ https://issues.apache.org/jira/browse/HBASE-11444?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Andrew Purtell updated HBASE-11444:

    Summary: Remove use of reflection for User#getShortName  (was: Remove use of reflection
in the User facade)

> Remove use of reflection for User#getShortName
> ----------------------------------------------
>                 Key: HBASE-11444
>                 URL: https://issues.apache.org/jira/browse/HBASE-11444
>             Project: HBase
>          Issue Type: Improvement
>            Reporter: Andrew Purtell
>            Assignee: Andrew Purtell
>             Fix For: 0.99.0
>         Attachments: HBASE-11444.patch, IntegrationTestIngestWithACL.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. 
> 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

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