Hi there, our Kafka Streams applications occasionally show messages like the following:
[AdminClient clientId=prod.index-document-aggregator-0-admin] Skipping return offset for prod.document-20 due to error UNSTABLE_OFFSET_COMMIT. As far as I understand, this originates from Kafka brokers rather than Kafka Streams, see ListConsumerOffsetsHandler#handleResponse (https://github.com/apache/kafka/blob/trunk/clients/src/main/java/org/apache/kafka/clients/admin/internals/ListConsumerGroupOffsetsHandler.java). May someone please shed some light on this message and its implications? Or, more specifically: Does this imply possible data loss? (We’re not using exactly_once semantics, duplicate processing would be not so much of an issue.) Are there broker side logs or metrics that might help identify the root cause? (Replica fetcher metrics show all zeros.) Thanks, Karsten
