如下示例将主题foo的分区0的复制因子从1增加到3。

在增加复制因子之前，该分区的唯一副本存在于broker.id为5的节点上，我们将在broker.id为6和7的节点上各增加一个副本。

参考   

Kafka——副本（Replica）机制

https://www.cnblogs.com/caoweixiong/p/12049462.html

kafka 调整partiton数目和replica factor

https://www.zhyea.com/2018/07/13/kafka-reset-partition-num-and-replica-factor.html

kafka replication tools

https://cwiki.apache.org/confluence/display/KAFKA/Replication+tools

kafka basic_ops_increase_replication_factor

https://kafka.apache.org/21/documentation.html#basic_ops_increase_replication_factor

在Kafka中修改Topic的preferred replica

https://www.cnblogs.com/yinchengzhe/p/5121329.html

kafka中对一个topic增加replicas

https://www.cnblogs.com/yinchengzhe/p/5121149.html