[HDFS-7046] HA NN can NPE upon transition to active

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 2.5.0, 3.0.0-alpha1
• Fix Version/s: 2.6.0
• Component/s: namenode
• Target Version/s: 2.6.0
• Hadoop Flags: Reviewed
• Assignee: Kihwal Lee
• Reporter: Daryn Sharp
• Created: 11/Sep/14 14:14
• Updated: 12/May/16 18:11
• Resolved: 19/Sep/14 22:09

Description

While processing edits, the NN may decide after adjusting block totals to leave safe mode - in the middle of the edit. Going active starts the secret manager which generates a new secret key, which in turn generates an edit, which NPEs because the edit log is not open.

1. Transitions should not occur in the middle of an edit.
2. The edit log appears to claim it's open for write when the stream isn't even open