[HDFS-1800] Extend image checksumming to function with multiple fsimage files

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Edit log branch (HDFS-1073)
• Fix Version/s: Edit log branch (HDFS-1073)
• Component/s: namenode
• Hadoop Flags: Reviewed
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 01/Apr/11 21:03
• Updated: 16/May/11 00:06
• Resolved: 13/May/11 03:33

Description

HDFS-903 added the MD5 checksum of the fsimage to the VERSION file in each image directory. This allows it to verify that the FSImage didn't get corrupted or accidentally replaced on disk.

With HDFS-1073, there may be multiple fsimage_N files in a storage directory corresponding to different checkpoints. So having a single MD5 in the VERSION file won't suffice. Instead we need to store an MD5 per image file.