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https://issues.apache.org/jira/browse/HADOOP-17485?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17269655#comment-17269655
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Ahmed Hussein commented on HADOOP-17485:
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{quote}Why are you making this change as part of this backporting HADOOP-17079?
Wouldn't it be better to pull back HADOOP-17467 separately when it is done?
{quote}
Ok. sounds reasonable.
{quote}Seems like most of these would be good to have in trunk as well. Why not
make these changes in trunk and then pull that Jira back to 2.10?
{quote}
I did it in 2.10 to pass Yetus. I thought that doing it in trunk will be a
large change that might be taken as a refactor and get stuck.
If you see it is good to have in trunk, then I believe I wait for HADOOP-17467
. Then File a new jira to remove deprecations. Finally back-port to 2.10.
WDYT?
> 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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