I am practicing turning on rack awareness on a test cluster. With a cluster of 3 nodes that currently does not use rack awareness (broker.rack is not set). During a rolling restart of the brokers where broker.rack was filled in one by one, on each node I got the error
[2017-06-06 15:41:08,780] ERROR kafka.admin.AdminOperationException: Not all brokers have rack information. Add --disable-rack-aware in command line to make replica assignment without rack information. at kafka.admin.AdminUtils$.getBrokerMetadatas(AdminUtils.scala:395) at kafka.admin.AdminUtils$.createTopic(AdminUtils.scala:413) at kafka.admin.TopicCommand$.createTopic(TopicCommand.scala:107) at kafka.admin.TopicCommand$.main(TopicCommand.scala:60) at kafka.admin.TopicCommand.main(TopicCommand.scala) Then Kafka client fail to connect to the brokers. I do another rolling restart and because now all brokers know their rack it seems that things sort themselves out. Wondering if anyone can recommend how I should turn on rack awareness without downtime? Is that possible? Thanks, Neil
