[HDFS-11242] Add refresh cluster network topology operation to dfs admin

• Type: Improvement
• Status: Patch Available
• Priority: Minor
• Resolution: Unresolved
• Affects Version/s: 3.0.0-alpha1
• Component/s: namenode
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: Reid Chan
• Created: 14/Dec/16 06:18
• Updated: 02/Nov/23 15:39

Description

The network topology and dns to switch mapping are initialized at the start of the namenode.
If admin wants to change the topology because of new datanodes added, he has to stop and restart namenode(s), otherwise those new added datanodes are squeezed under /default-rack.
It is a low frequency operation, but it should be operated appropriately, so dfs admin should take the responsibility.

Issue Links

• is duplicated by: HDFS-16368 DFSAdmin supports refresh topology info without restarting namenode
• relates to: HDFS-14635 Support to refresh the rack awareness dynamically
• links to: GitHub Pull Request #3790