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https://issues.apache.org/jira/browse/KAFKA-9930?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adem Efe Gencer resolved KAFKA-9930.
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Resolution: Fixed
> Prevent ReplicaFetcherThread from throwing UnknownTopicOrPartitionException
> upon topic creation and deletion.
> -------------------------------------------------------------------------------------------------------------
>
> Key: KAFKA-9930
> URL: https://issues.apache.org/jira/browse/KAFKA-9930
> Project: Kafka
> Issue Type: Bug
> Components: logging
> Affects Versions: 0.10.0.0, 0.11.0.0, 1.0.0, 1.1.0, 2.0.0, 2.1.0, 2.2.0,
> 2.3.0, 2.4.0, 2.5.0
> Reporter: Adem Efe Gencer
> Assignee: Adem Efe Gencer
> Priority: Minor
>
> When does UnknownTopicOrPartitionException typically occur?
> * Upon a topic creation, a follower broker of a new partition starts replica
> fetcher before the prospective leader broker of the new partition receives
> the leadership information from the controller. Apache Kafka has a an open
> issue about this (see KAFKA-6221)
> * Upon a topic deletion, a follower broker of a to-be-deleted partition
> starts replica fetcher after the leader broker of the to-be-deleted partition
> processes the deletion information from the controller.
> * As expected, clusters with frequent topic creation and deletion report
> UnknownTopicOrPartitionException with relatively higher frequency.
> What is the impact?
> * Exception tracking systems identify the error logs with
> UnknownTopicOrPartitionException as an exception. This results in a lot of
> noise for a transient issue that is expected to recover by itself and a
> natural process in Kafka due to its asynchronous state propagation.
> Why not move it to a lower than warn-level log?
> * Despite typically being a transient issue,
> UnknownTopicOrPartitionException may also indicate real issues if it doesn't
> fix itself after a short period of time. To ensure detection of such
> scenarios, we set the log level to warn.
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