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Kafka >> mail # user >> ConsumerRebalanceFailedException when broker unavailable

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Re: ConsumerRebalanceFailedException when broker unavailable
I think this is addressed in KAFKA-969

On Fri, Jul 12, 2013 at 5:55 PM, Florin Trofin <[EMAIL PROTECTED]> wrote:
> Hello,
> I'm going through a series of tests with Kafka 0.8 to see what the failure cases are. One simple scenario is this:
> 1. Launch Zookeeper
> 2. Launch my consumer (written in scala) but don't launch a Kafka broker (I am not using replication in my configuration).
> What happens in this particular scenario is that my consumer hits the createMessageStreams which internally makes 4 failed attempts and then it raises a ConsumerRebalanceFailedException:
> kafka.common.ConsumerRebalanceFailedException: zfilter_vm-florin-ubuntu-d-12-1373675347482-ff93b841 can't rebalance after 4 retries
>         at kafka.consumer.ZookeeperConsumerConnector$ZKRebalancerListener.syncedRebalance(ZookeeperConsumerConnector.scala:397)
>         at kafka.consumer.ZookeeperConsumerConnector.kafka$consumer$ZookeeperConsumerConnector$$reinitializeConsumer(ZookeeperConsumerConnector.scala:681)
>         at kafka.consumer.ZookeeperConsumerConnector.consume(ZookeeperConsumerConnector.scala:205)
>         at kafka.consumer.ZookeeperConsumerConnector.createMessageStreams(ZookeeperConsumerConnector.scala:133)
>         at kafka.consumer.ZookeeperConsumerConnector.createMessageStreams(ZookeeperConsumerConnector.scala:126)
> I was expecting a more specific exception - something like NoBrokerAvailable instead of this. I can add a catch clause for this exception and retry the operation in a loop until the broker comes online but I dislike the approach because I am making an assumption here - that ConsumerRebalanceFailedException means "no broker available". Is there a better way to do this? Do you have a pattern for consumers for when brokers go offline and come back up?
> Thanks a lot!
> Florin