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https://issues.apache.org/jira/browse/KAFKA-6263?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manikumar resolved KAFKA-6263.
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Fix Version/s: 2.4.0
Resolution: Fixed
> Expose metric for group metadata loading duration
> -------------------------------------------------
>
> Key: KAFKA-6263
> URL: https://issues.apache.org/jira/browse/KAFKA-6263
> Project: Kafka
> Issue Type: Improvement
> Components: core
> Reporter: Jason Gustafson
> Assignee: Anastasia Vela
> Priority: Major
> Fix For: 2.4.0
>
>
> We have seen in several cases where the log cleaner either wasn't enabled or
> had experienced some failure that __consumer_offsets partitions can grow
> excessively. When one of these partitions changes leadership, the new
> coordinator must load the offset cache from the start of the log, which can
> take arbitrarily long depending on how large the partition has grown (we have
> seen cases where it took hours). Catching this problem is not always easy
> because the condition is rare and the symptom just tends to be a long period
> of inactivity in the consumer group which gradually gets worse over time. It
> may therefore be useful to have a broker metric for the load time so that it
> can be monitored and potentially alerted on. Same thing goes for the
> transaction log
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