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https://issues.apache.org/jira/browse/HADOOP-12858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daryn Sharp updated HADOOP-12858:
---------------------------------
Attachment: HADOOP-12858.patch
Pushed all the group list massaging into the groups cache loader instead of
being performed for every group lookup. Also eliminates need for double
conversion from a list to array and back to test for group membership.
Part of a larger set of internal 2.7 performance patches. Subsequent hdfs
change will require this patch.
> 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
>
>
> Group lookup generates excessive garbage with multiple conversions between
> collections and arrays.
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