kafka扩容

一、扩容简单，增长节点便可，保证broker id在集群中惟一，复制集群配置文件到新增节点机器上，启动节点server 脚本便可。 二、迁移历史数据 Adding servers to a Kafka cluster is easy, just assign them a unique broker id and start up Kafka on your new servers. Howeve

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