[HDFS-16424] Add a new rpcMetric called requeueTime

• Type: Improvement
• Status: Open
• Priority: Minor
• Resolution: Unresolved
• Component/s: namenode
• Labels: pull-request-available
• Assignee: Unassigned
• Reporter: farmmamba
• Created: 13/Jan/22 09:32
• Updated: 18/Jan/22 01:56

Description

When observer namenode read enabled,  if `call.getClientStateId() > alignmentContext.getLastSeenStateId()`, the rpc call will be requeued to callQueue.

we need to know rpc requeue metrics to monitor requeue call and its performance.

Issue Links

• links to: GitHub Pull Request #3884