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https://issues.apache.org/jira/browse/HADOOP-17079?focusedWorklogId=538590&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-538590
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ASF GitHub Bot logged work on HADOOP-17079:
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Author: ASF GitHub Bot
Created on: 20/Jan/21 18:10
Start Date: 20/Jan/21 18:10
Worklog Time Spent: 10m
Work Description: amahussein opened a new pull request #2631:
URL: https://github.com/apache/hadoop/pull/2631
Porting to Hadoop-2.10 three commits related to Groups.
HADOOP-13965. Groups should be consistent in using default group mapp…
[383aa9c](https://github.com/apache/hadoop/commit/383aa9c9f55983cdb1c225b2ed22f6f48616cb9c)
HDFS-13723. Occasional "Should be different group" error in TestRefre…
[162228e](https://github.com/apache/hadoop/commit/162228e8db937d4bdb9cf61d15ed555f1c96368f)
HADOOP-17079. Optimize UGI#getGroups by adding UGI#getGroupsSet.
[f91a8ad](https://github.com/apache/hadoop/commit/f91a8ad88b00b50231f1ae3f8820a25c963bb561)
(#2085)
CC: @linyiqun @smengcl @xiaoyuyao @jojochuang @jbrennan333
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Issue Time Tracking
-------------------
Worklog Id: (was: 538590)
Remaining Estimate: 0h
Time Spent: 10m
> Optimize UGI#getGroups by adding UGI#getGroupsSet
> -------------------------------------------------
>
> Key: HADOOP-17079
> URL: https://issues.apache.org/jira/browse/HADOOP-17079
> Project: Hadoop Common
> Issue Type: Improvement
> Reporter: Xiaoyu Yao
> Assignee: Xiaoyu Yao
> Priority: Major
> Fix For: 3.4.0
>
> Attachments: HADOOP-17079.002.patch, HADOOP-17079.003.patch,
> HADOOP-17079.004.patch, HADOOP-17079.005.patch, HADOOP-17079.006.patch,
> HADOOP-17079.007.patch
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> UGI#getGroups has been optimized with HADOOP-13442 by avoiding the
> List->Set->List conversion. However the returned list is not optimized to
> contains lookup, especially the user's group membership list is huge
> (thousands+) . This ticket is opened to add 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.
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