Thank you for the replies. I was able to lower the replication factor by using the kafka-reassign-partitions.sh tool. What initially threw me off was kafka-reassign-partitions.sh --generate was giving this error:
Partitions reassignment failed due to replication factor: 3 larger than available brokers: 2 kafka.admin.AdminOperationException: replication factor: 3 larger than available brokers: 2 at kafka.admin.AdminUtils$.assignReplicasToBrokers(AdminUtils.scala:70) at kafka.admin.ReassignPartitionsCommand$$anonfun$generateAssignment$1.apply(ReassignPartitionsCommand.scala:97) at kafka.admin.ReassignPartitionsCommand$$anonfun$generateAssignment$1.apply(ReassignPartitionsCommand.scala:96) at scala.collection.immutable.Map$Map1.foreach(Map.scala:109) at kafka.admin.ReassignPartitionsCommand$.generateAssignment(ReassignPartitionsCommand.scala:96) at kafka.admin.ReassignPartitionsCommand$.main(ReassignPartitionsCommand.scala:45) at kafka.admin.ReassignPartitionsCommand.main(ReassignPartitionsCommand.scala) However running kafka-reassign-partitions.sh --execute against a manually created json file worked as expected. I documented my experiences in a JIRA ticket here: https://issues.apache.org/jira/browse/KAFKA-2267 On Wed, Jun 10, 2015 at 4:31 PM, James Cheng <jch...@tivo.com> wrote: > AirBNB's kafkat tool has a "set-replication-factor" option. I've never > tried it myself. > > https://github.com/airbnb/kafkat > > -James > > > On Jun 10, 2015, at 4:20 PM, Aditya Auradkar > <aaurad...@linkedin.com.INVALID> wrote: > > > > The replica list that you specify can be used to increment/decrement the > replication factor. > > > http://kafka.apache.org/documentation.html#basic_ops_increase_replication_factor > > > > Aditya > > > > ________________________________________ > > From: Robin Yamaguchi [ro...@tune.com] > > Sent: Wednesday, June 10, 2015 4:05 PM > > To: users@kafka.apache.org > > Subject: Changing replication factor for an existing topic > > > > Greetings, > > > > With Kafka 0.8.2.1, is there a way to either raise or lower the > replication > > factor of an existing topic? Searching through this list, there was > > mention that the tool has yet to be developed. It doesn't seem possible > > still looking at the replication tools wiki, nor with yahoo's kafka > > manager. Thought I give this list another shot. > > > > Thank you, > > Robin > >
