[HDFS-11906] Add log for NameNode#monitorHealth

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Assignee: Chen Liang
• Reporter: Chen Liang
• Created: 31/May/17 18:10
• Updated: 31/May/17 19:27
• Resolved: 31/May/17 19:27

Description

We've seen cases where NN had long delays that we suspect were due to NameNode#monitorHealth was spending too much time on getNamesystem().checkAvailableResources();. However due to the lack of logging, it can be hard to verify. This JIRA tries to add some log to this function, that display the actual time spent.

Thanks arpitagarwal for the offline discussion.