[HDFS-4269] DatanodeManager#registerDatanode rejects all datanode registrations from localhost in single-node developer setup

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: trunk-win, 2.1.0-beta, 3.0.0-alpha1
• Fix Version/s: 2.1.0-beta
• Component/s: namenode
• Target Version/s: trunk-win, 2.1.0-beta
• Hadoop Flags: Reviewed
• Assignee: Chris Nauroth
• Reporter: Chris Nauroth
• Created: 05/Dec/12 04:40
• Updated: 12/May/16 18:15
• Resolved: 22/Feb/13 23:54

Description

HDFS-3990 is a change that optimized some redundant DNS lookups. As part of that change, DatanodeManager#registerDatanode now rejects attempts to register a datanode for which the name has not been resolved. Unfortunately, this broke single-node developer setups on Windows, because Windows does not resolve 127.0.0.1 to "localhost".

Issue Links

• is broken by: HDFS-3990 NN's health report has severe performance problems
• is related to: HDFS-5338 Add a conf to disable hostname check in DN registration
• relates to: HDFS-4702 remove namesystem lock from DatanodeManager#fetchDatanodes