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From "Vinayakumar B (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7454) Reduce memory footprint for AclEntries in NameNode
Date Fri, 05 Dec 2014 08:08:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235254#comment-14235254
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Vinayakumar B commented on HDFS-7454:
-------------------------------------

Thanks Chris. I will add Acl indicator in a follow up jira. 
Thanks Haohui Mai for the review and commit.

> Reduce memory footprint for AclEntries in NameNode
> --------------------------------------------------
>
>                 Key: HDFS-7454
>                 URL: https://issues.apache.org/jira/browse/HDFS-7454
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>             Fix For: 2.7.0
>
>         Attachments: HDFS-7454-001.patch, HDFS-7454-002.patch, HDFS-7454-003.patch, HDFS-7454-004.patch
>
>
> HDFS-5620 indicated a GlobalAclSet containing unique {{AclFeature}} can be de-duplicated
to save the memory in NameNode. However it was not implemented at that time.
> This Jira re-proposes same implementation, along with de-duplication of unique {{AclEntry}}
across all ACLs.
> One simple usecase is:
> A mapreduce user's home directory with the set of default ACLs, under which lot of other
files/directories could be created when jobs is run. Here all the default ACLs of parent directory
will be duplicated till the explicit delete of those ACLs. With de-duplication,only one object
will be in memory for the same Entry across all ACLs of all files/directories.



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