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https://issues.apache.org/jira/browse/HDFS-4908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tsz Wo (Nicholas), SZE updated HDFS-4908:
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Attachment: h4908_20130619.patch
Thanks Jing for the comments. Here is a new patch.
h4908_20130619.patch
> 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, h4908_20130619.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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