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From "Chris Nauroth (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7456) De-duplicate AclFeature instances with same AclEntries do reduce memory footprint of NameNode
Date Fri, 05 Dec 2014 19:39:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7456?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14235976#comment-14235976
] 

Chris Nauroth commented on HDFS-7456:
-------------------------------------

On a side note, the same techniques are applicable to {{XAttrFeature}}, though I don't know
if anyone has enough experience with real-world xattr usage yet to tell if they tend to experience
a high degree of duplication in the values like ACLs do.

> De-duplicate AclFeature instances with same AclEntries do reduce memory footprint of
NameNode
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-7456
>                 URL: https://issues.apache.org/jira/browse/HDFS-7456
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: namenode
>            Reporter: Vinayakumar B
>            Assignee: Vinayakumar B
>         Attachments: HDFS-7456-001.patch, HDFS-7456-002.patch
>
>
> As discussed  in HDFS-7454 [here|https://issues.apache.org/jira/browse/HDFS-7454?focusedCommentId=14229454&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14229454],
de-duplication of {{AclFeature}} helps in reducing the memory footprint of the namenode.



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