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https://issues.apache.org/jira/browse/HADOOP-17485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269587#comment-17269587
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Jim Brennan commented on HADOOP-17485:
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[~ahussein], can you please summarize any changes that were needed to port this
back? Or was it a clean cherry-pick?
> port UGI#getGroupsSet optimizations into 2.10
> ---------------------------------------------
>
> Key: HADOOP-17485
> URL: https://issues.apache.org/jira/browse/HADOOP-17485
> Project: Hadoop Common
> Issue Type: Bug
> Reporter: Ahmed Hussein
> Assignee: Ahmed Hussein
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> HADOOP-17079 introduced an optimization adding a UGI#getGroupsSet and use
> Set#contains() instead of List#contains() to speed up large group look up
> while minimize List->Set conversions in Groups#getGroups() call.
> This ticket is to port the changes into branch-2.10.
>
> CC: [~Jim_Brennan], [~xyao]
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