PublishKafka writes messages only to those Kafka nodes that are leaders for a given topic: partition. Now it's Kafka internal job to keep the In-Sync Replicas in sync with its leader. So with respect to your question: When the Publisher client is set to run ,client sends a (read/write) request the bootstrap server, listed in the configuration bootstrap.servers to get the metadata info about topic: partition details, that's how the client knows who are all leaders in given topic partitions and the Publisher client writes into leaders of topic: partition With "Guarantee single node" and if kafka broker node goes down which was happen to be a leader for topic: partition then Kafka will assign a new leader from ISR list for topic: partition and through Kafka client setting metadata.max.age.ms producer refreshed its metadata information will get to know who is next leader to produce. If you found this response assisted with your issue, please take a moment and click on "Accept as Solution" below this post. Thank you
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