[HDFS-4749] Use INodeId to identify the corresponding directory node for FSImage saving/loading

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: Snapshot (HDFS-2802)
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 25/Apr/13 00:21
• Updated: 26/Apr/13 13:09
• Resolved: 25/Apr/13 18:51

Description

Currently in fsimage, we use the path to locate a directory node for later loading, i.e., when loading a subtree from fsimage, we first read the path of the directory node, and resolve the path to identify the directory node. This brings extra complexity since we need to generate path for directory nodes in both the current tree and snapshot copies.

As a simplification, we can use INodeId to identify the directory node.