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From "Xiaoyu Yao (Jira)" <j...@apache.org>
Subject [jira] [Updated] (HADOOP-17079) Optimize UGI#getGroups by adding UGI#getGroupsSet
Date Thu, 25 Jun 2020 23:58:00 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-17079?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Xiaoyu Yao updated HADOOP-17079:
    Attachment: HADOOP-17079.003.patch

> 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
>         Attachments: HADOOP-17079.002.patch, HADOOP-17079.003.patch
> 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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