[HDFS-4288] NN accepts incremental BR as IBR in safemode

• Type: Bug
• Status: Closed
• Priority: Critical
• Resolution: Fixed
• Affects Version/s: 0.23.0, 2.0.0-alpha, 3.0.0-alpha1
• Fix Version/s: 2.0.3-alpha, 0.23.7
• Component/s: namenode
• Target Version/s: 2.0.3-alpha, 0.23.7
• Assignee: Daryn Sharp
• Reporter: Daryn Sharp
• Created: 07/Dec/12 20:17
• Updated: 12/May/16 18:16
• Resolved: 29/Jan/13 22:55

Description

If a DN is ready to send an incremental BR and the NN goes down, the DN will repeatedly try to reconnect. The NN will then process the DN's incremental BR as an initial BR. The NN now thinks the DN has only a few blocks, and will ignore all subsequent BRs from that DN until out of safemode – which it may never do because of all the "missing" blocks on the affected DNs.

Issue Links

• relates to: HDFS-4379 DN block reports should include a sequence number