[HDFS-4694] The SecondaryNameNode may change the inode id of root while doing checkpoint

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.0.0-alpha1
• Component/s: namenode
• Assignee: Jing Zhao
• Reporter: Jing Zhao
• Created: 15/Apr/13 01:00
• Updated: 12/May/16 18:11
• Resolved: 15/Apr/13 21:09

Description

SNN will call FSNamesystem#clear while merging the fsimage to its local FSNamesystem, and the FSDirectory will be reset in this process. However, in FSDirectory#reset, a new inode id will be allocated and assigned to the new root.

To fix the problem, we can either pass in an inode id in FSDirectory#createRoot, or update the root id in FSImageFormat#updateRootAttr.