[HDFS-16584] Record StandbyNameNode information when Balancer is running

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.3.0
• Fix Version/s: 3.4.0
• Component/s: balancer & mover, namenode
• Labels: pull-request-available
• Hadoop Flags: Reviewed
• Assignee: JiangHua Zhu
• Reporter: JiangHua Zhu
• Created: 19/May/22 12:56
• Updated: 23/May/22 02:57
• Resolved: 22/May/22 14:04

Description

When the Balancer is running, we allow block data to be fetched from the StandbyNameNode, which is nice. Here are some logs:

But we have no way of knowing which NameNode the request was made to. We should log more detailed information, such as the host associated with the StandbyNameNode.

Issue Links

• is related to: HDFS-13183 Standby NameNode process getBlocks request to reduce Active load
• relates to: HDFS-16588 Backport HDFS-16584 to branch-3.3.
• links to: GitHub Pull Request #4333