Jason Gustafson created KAFKA-6263:
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Summary: Expose metric for group metadata loading duration
Key: KAFKA-6263
URL: https://issues.apache.org/jira/browse/KAFKA-6263
Project: Kafka
Issue Type: Improvement
Reporter: Jason Gustafson
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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