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From "Colin Patrick McCabe (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-12858) Reduce UGI getGroups overhead
Date Tue, 08 Mar 2016 19:30:41 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-12858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185578#comment-15185578
] 

Colin Patrick McCabe commented on HADOOP-12858:
-----------------------------------------------

Thanks, [~daryn].  Can you add a comment to {{getGroups}} that points out that the first entry
is the primary group?

> Reduce UGI getGroups overhead
> -----------------------------
>
>                 Key: HADOOP-12858
>                 URL: https://issues.apache.org/jira/browse/HADOOP-12858
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: performance
>    Affects Versions: 2.0.0-alpha
>            Reporter: Daryn Sharp
>            Assignee: Daryn Sharp
>         Attachments: HADOOP-12858.patch, HADOOP-12858.patch
>
>
> Group lookup generates excessive garbage with multiple conversions between collections
and arrays.



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