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https://issues.apache.org/jira/browse/KAFKA-1543?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14065616#comment-14065616
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Jay Kreps commented on KAFKA-1543:
----------------------------------

I wonder if it would make more sense to have the alter topic command do this. 
Something like:
{code}
  bin/kafka-topics.sh --zookeeper host:port --alter --topic name 
--replication-factor 3
{code}

> Changing replication factor
> ---------------------------
>
>                 Key: KAFKA-1543
>                 URL: https://issues.apache.org/jira/browse/KAFKA-1543
>             Project: Kafka
>          Issue Type: Improvement
>            Reporter: Alexey Ozeritskiy
>         Attachments: can-change-replication.patch
>
>
> It is difficult to change replication factor by manual editing json config.
> I propose to add a key to kafka-reassign-partitions.sh command to 
> automatically create json config.
> Example of usage
> {code}
> kafka-reassign-partitions.sh --zookeeper zk --replicas new-replication-factor 
> --topics-to-move-json-file topics-file --broker-list 1,2,3,4 --generate > 
> output
> {code}



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