[HDFS-6563] NameNode cannot save fsimage in certain circumstances when snapshots are in use

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.4.0
• Fix Version/s: 2.5.0
• Component/s: namenode, snapshots
• Target Version/s: 2.5.0
• Hadoop Flags: Reviewed
• Assignee: Aaron Myers
• Reporter: Aaron Myers
• Created: 19/Jun/14 00:03
• Updated: 15/Aug/14 05:41
• Resolved: 19/Jun/14 05:20

Description

Checkpoints will start to fail and the NameNode will not be able to manually saveNamespace if the following set of steps occurs:

1. A zero-length file appears in a snapshot
2. That file is later lengthened to include at least one block
3. That file is subsequently deleted from the present file system but remains in the snapshot

More details in the first comment.