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https://issues.apache.org/jira/browse/HDFS-5620?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13877990#comment-13877990
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Haohui Mai commented on HDFS-5620:
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I don't think we'll need to implement this one right now. An approach similar
to HDFS-5793 (i.e., deduplicating during loading / saving FSImage) might be
sufficient for most of the real-world use cases.
> NameNode: implement Global ACL Set as a space optimization.
> -----------------------------------------------------------
>
> Key: HDFS-5620
> URL: https://issues.apache.org/jira/browse/HDFS-5620
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: namenode
> Affects Versions: HDFS ACLs (HDFS-4685)
> Reporter: Chris Nauroth
> Assignee: Chris Nauroth
>
> The {{AclManager}} can maintain a Global ACL Set to store all distinct ACLs
> in use by the file system. All inodes that have the same ACL entries can
> share the same ACL instance.
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