[jira] [Updated] (HDFS-4908) Reduce snapshot inode memory usage

["Tsz Wo (Nicholas), SZE (JIRA)" <ji...@apache.org>]

     [ 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: h4908_20130617.patch

h4908_20130617.patch: initial patch.  Still need to fix OfflineImageViewer.
                
> 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: 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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