[KAFKA-3139] JMX metric ProducerRequestPurgatory doesn't exist, docs seem wrong.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Assignee: Unassigned
• Reporter: James Cheng
• Created: 22/Jan/16 21:51
• Updated: 22/Aug/17 20:30
• Resolved: 22/Aug/17 20:30

Description

The docs say that there is a JMX metric

kafka.server:type=ProducerRequestPurgatory,name=PurgatorySize

But that doesn't seem to work. Using jconsole to inspect our kafka broker, it seems like the right metric is

kafka.server:type=DelayedOperationPurgatory,name=PurgatorySize,delayedOperation=Produce

And there are also variants of the above for Fetch, Heartbeat, and Rebalance.

Is the fix to simply update the docs? From what I can see, the docs for this don't seem auto-generated from code. If it is a simple doc fix, I would like to take this JIRA.

Btw, what is NumDelayedOperations, and how is it different from PurgatorySize?

kafka.server:type=DelayedOperationPurgatory,name=NumDelayedOperations,delayedOperation=Produce

And should I also update the docs for that?