Tsz Wo (Nicholas), SZE created HDFS-4908:
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Summary: 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
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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