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Date: Mon, 17 Jun 2013 08:04:22 +0000 (UTC)
From: "Tsz Wo (Nicholas), SZE (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.12653070.1371396456778.124301.1371456262541@arcas>
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Subject: [jira] [Updated] (HDFS-4908) Reduce snapshot inode memory usage
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     [ https://issues.apache.org/jira/browse/HDFS-4908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tsz Wo (Nicholas), SZE updated HDFS-4908:
-----------------------------------------

    Attachment: editsStored

editsStored: updated edit file.
                
> Reduce snapshot inode memory usage
> ----------------------------------
>
>                 Key: HDFS-4908
>                 URL: https://issues.apache.org/jira/browse/HDFS-4908
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode, snapshots
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: 2.1.0-beta
>
>         Attachments: editsStored, h4908_20130617b.patch, h4908_20130617c.patch, h4908_20130617.patch
>
>
> Snapshots currently use INodeFile and INodeDirectory for storing previous file/dir states as snapshot inodes.  However, INodeFile and INodeDirectory have some fields not used by snapshot inodes such as parent reference, inode id, block/children reference.  The memory footprint could be reduced by having some specific classes for snapshot inodes.

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