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https://issues.apache.org/jira/browse/HADOOP-13442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15407961#comment-15407961
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Kihwal Lee commented on HADOOP-13442:
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+1 nice changes. The removal of synchronization looks safe after the changes to
the static mapping.
> Optimize UGI group lookups
> --------------------------
>
> Key: HADOOP-13442
> URL: https://issues.apache.org/jira/browse/HADOOP-13442
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Daryn Sharp
> Assignee: Daryn Sharp
> Attachments: HADOOP-13442.patch
>
>
> {{UGI#getGroups}} and its usage is inefficient. The list is unnecessarily
> converted to multiple collections.
> For _every_ invocation, the {{List<String>}} from the group provider is
> converted into a {{LinkedHashSet<String>}} (to de-dup), back to a
> {{String[]}}. Then callers testing for group membership convert back to a
> {{List<String>}}. This should be done once to reduce allocations.
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