[HDFS-3922] 0.22 and 0.23 namenode throws away blocks under construction on restart

• Type: Bug
• Status: Resolved
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.22.1, 0.23.3
• Fix Version/s: 0.23.4
• Component/s: namenode
• Target Version/s: 0.23.4
• Hadoop Flags: Reviewed
• Assignee: Kihwal Lee
• Reporter: Kihwal Lee
• Created: 11/Sep/12 23:05
• Updated: 28/Sep/12 12:40
• Resolved: 27/Sep/12 18:12

Description

When reading edits on startup, namenode may throw away blocks under construction. This is because the file inode is turned into a "under construction" one, but nothing is done to the last block.

With append/hsync, this is not acceptable because it may drop sync'ed partial blocks. In branch 2 and trunk, HDFS-1623 (HA) fixed this issue.