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https://issues.apache.org/jira/browse/KAFKA-5666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jason Gustafson updated KAFKA-5666:
-----------------------------------
Labels: newbie usability (was: newbie)
> Need feedback to user if consumption fails due to
> offsets.topic.replication.factor=3
> ------------------------------------------------------------------------------------
>
> Key: KAFKA-5666
> URL: https://issues.apache.org/jira/browse/KAFKA-5666
> Project: Kafka
> Issue Type: Improvement
> Components: clients, consumer
> Affects Versions: 0.11.0.0
> Reporter: Yeva Byzek
> Labels: newbie, usability
>
> Introduced in 0.11: The offsets.topic.replication.factor broker config is now
> enforced upon auto topic creation. Internal auto topic creation will fail
> with a GROUP_COORDINATOR_NOT_AVAILABLE error until the cluster size meets
> this replication factor requirement.
> Issue: Default is setting offsets.topic.replication.factor=3, but in
> development and docker environments where there is only 1 broker, the offsets
> topic will fail to be created when a consumer tries to consume and no records
> will be returned. As a result, the user experience is bad. The user may
> have no idea about this setting change and enforcement, and they just see
> that `kafka-console-consumer` hangs with ZERO output. It is true that the
> broker log file will provide a message (e.g. {{ERROR [KafkaApi-1] Number of
> alive brokers '1' does not meet the required replication factor '3' for the
> offsets topic (configured via 'offsets.topic.replication.factor'). This error
> can be ignored if the cluster is starting up and not all brokers are up yet.
> (kafka.server.KafkaApis)}}) but many users do not have access to the log
> files or know how to get them.
> Suggestion: give feedback to the user/app if offsets topic cannot be created.
> For example, after some timeout.
> Workaround:
> Set offsets.topic.replication.factor=3
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