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https://issues.apache.org/jira/browse/KAFKA-19188?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Fredrik Lysén updated KAFKA-19188:
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Summary: kafka-topics.sh --describe output is inconsistent immediately
after cluster restart (was: kafka-topics.sh --describe output for
message.format.version is inconsistent immediately after cluster restart when
not set at topic level)
> kafka-topics.sh --describe output is inconsistent immediately after cluster
> restart
> -----------------------------------------------------------------------------------
>
> Key: KAFKA-19188
> URL: https://issues.apache.org/jira/browse/KAFKA-19188
> Project: Kafka
> Issue Type: Bug
> Components: admin
> Affects Versions: 3.9.0
> Environment: Amazon Linux 2 (EC2 instances)
> Reporter: Fredrik Lysén
> Priority: Trivial
>
> When running {{kafka-topics.sh --describe}} to inspect topic configuration
> immediately after restarting a Kafka broker, the \{{}}
> {code:java}
> message.format.version{code}
> property is inconsistently present in the output.
> *Steps to reproduce:*
> # Set up a 3-broker Kafka cluster.
> # On brokers 1 and 2, set {{log.message.format.version=3.2}} in
> {{{}server.properties{}}}.
> # On broker 3 (the one you will use as {{{}--bootstrap-server{}}}), do *not*
> set {{{}log.message.format.version{}}}.
> # Create a topic without setting {{message.format.version}} at the topic
> level.
> # Restart the cluster.
> # Immediately after restart, run:
> {code:java}
> kafka-topics.sh --bootstrap-server <broker-3>:9092 --describe
> --command-config <config> {code}
> * {color:#FF0000}Observe the output for the topic configuration.{color}
> *Expected behavior:*
> The {{message.format.version}} property should be reported consistently
> (either always present or always absent) in the topic config output,
> reflecting the inherited value from the broker configuration when not set at
> the topic level.
> *Actual behavior:*
> Immediately after restart, the output for the topic sometimes omits
> {{message.format.version}} in the config list, or shows it inconsistently
> between runs, even though the brokers' configs are stable and the cluster is
> healthy after a short delay.
> *Additional notes:*
> * After waiting for the cluster to stabilize, the config output becomes
> consistent.
> * This inconsistency may cause confusion for operational monitoring or
> automation tools that depend on the output of {{{}kafka-topics.sh
> --describe{}}}.
> *Example output:*
> {code:java}
> # Immediately after restart:
> Topic: example.topic Configs:
> min.insync.replicas=2,segment.bytes=536870912,unclean.leader.election.enable=false
> # After cluster stabilizes:
> Topic: example.topic Configs:
> min.insync.replicas=2,segment.bytes=536870912,message.format.version=3.2,unclean.leader.election.enable=false
> {code}
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