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https://issues.apache.org/jira/browse/KAFKA-12713?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17388324#comment-17388324
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Kai Huang commented on KAFKA-12713:
-----------------------------------
Twitter would be interested to pursue this work to debug latency issues.
[~mingaliu], I wonder do you mind if I take over this JIRA ticket and
[KIP-736|https://cwiki.apache.org/confluence/display/KAFKA/KIP-736%3A+Report+the+true+end+to+end+fetch+latency]?
> Report "REAL" follower/consumer fetch latency
> ---------------------------------------------
>
> Key: KAFKA-12713
> URL: https://issues.apache.org/jira/browse/KAFKA-12713
> Project: Kafka
> Issue Type: Bug
> Reporter: Ming Liu
> Priority: Major
>
> The fetch latency is an important metrics to monitor for the cluster
> performance. With ACK=ALL, the produce latency is affected primarily by
> broker fetch latency.
> However, currently the reported fetch latency didn't reflect the true fetch
> latency because it sometimes need to stay in purgatory and wait for
> replica.fetch.wait.max.ms when data is not available. This greatly affect the
> real P50, P99 etc.
> I like to propose a KIP to be able track the real fetch latency for both
> broker follower and consumer.
>
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