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https://issues.apache.org/jira/browse/KAFKA-6330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ismael Juma resolved KAFKA-6330.
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Resolution: Won't Fix
ZK support is removed in 4.0.
> KafkaZkClient request queue time metric
> ---------------------------------------
>
> Key: KAFKA-6330
> URL: https://issues.apache.org/jira/browse/KAFKA-6330
> Project: Kafka
> Issue Type: Sub-task
> Components: zkclient
> Reporter: Ismael Juma
> Priority: Major
> Labels: needs-kip
>
> KafkaZkClient have a latency metric which is the time it takes to send a
> request and receive the corresponding response.
> If ZooKeeperClient's `maxInFlightRequests` (10 by default) is reached, a
> request may be held for some time before sending starts. This time is not
> currently measured and it may be useful to know if requests are spending
> longer than usual in the `queue` (conceptually as the current implementation
> doesn't use a queue).
> This would require a KIP.
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