Jason Gustafson created KAFKA-14672:
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Summary: Producer queue time does not reflect batches expired in
the accumulator
Key: KAFKA-14672
URL: https://issues.apache.org/jira/browse/KAFKA-14672
Project: Kafka
Issue Type: Bug
Reporter: Jason Gustafson
The producer exposes two metrics for the time a record has spent in the
accumulator waiting to be drained:
* `record-queue-time-avg`
* `record-queue-time-max`
The metric is only updated when a batch is drained for sending to the broker.
It is also possible for a batch to be expired before it can be drained, but in
this case, the metric is not updated. This seems surprising and makes the queue
time misleading. The only metric I could find that does reflect batch
expirations in the accumulator is the generic `record-error-rate`. It would
make sense to let the queue-time metrics record the time spent in the queue
regardless of the outcome of the record send attempt.
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