Can anyone clarify if this is a bug in Kafka or the expected behavior?

Best regards,

On 30 January 2018 at 21:04, Wouter Bancken <>

> Hi,
> I'm trying to write an external tool to monitor consumer lag on Apache
> Kafka.
> For this purpose, I'm using the kafka-consumer-groups tool to fetch the
> consumer offsets.
> When using this tool, partition assignments seem to be unavailable
> temporarily during the creation of a new topic even if the consumer group
> has no subscription on this new topic. This seems to match the
> documentation
> <>
> saying *"Topic metadata changes which have no impact on subscriptions
> cause resync"*.
> However, when this occurs I'd expect the state of the consumer to be
> "PreparingRebalance" or "AwaitingSync" but it is simply "Stable".
> Is this a bug in the tooling or is there a different way to obtain the
> correct offsets for a consumer group during a rebalance?
> I'm using Kafka 10.2.1 but I haven't found any related issues in recent
> changelogs.
> Best regards,
> Wouter

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