kafka擴容

一、擴容簡單，增長節點便可，保證broker id在集羣中惟一，複製集羣配置文件到新增節點機器上，啓動節點server 腳本便可。 二、遷移歷史數據 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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