[HDFS-9882] Add heartbeatsTotal in Datanode metrics

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 2.7.2
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: datanode
• Hadoop Flags: Reviewed
• Assignee: Hua Liu
• Reporter: Hua Liu
• Created: 01/Mar/16 22:59
• Updated: 30/Aug/16 01:18
• Resolved: 08/Mar/16 05:12

Description

Heartbeat latency only reflects the time spent on generating reports and sending reports to NN. When heartbeats are delayed due to processing commands, this latency does not help investigation. I would like to propose to add another metric counter to show the total time.

Issue Links

• relates to: HDFS-9910 Datanode heartbeats can get blocked by disk in FsDatasetImpl#checkBlock()
• relates to: HDFS-9901 Move disk IO out of the heartbeat thread