二十：CDH5.14離線安裝kafka (含版本選擇)

一：當安裝好CDH的hadoop後，準備安裝kafka,可是CDH上添加服務是這樣的，沒法直接添加，需要添加相應包纔可以： Apache Kafka is publish-subscribe messaging rethought as a distributed commit log. Before adding this service, ensure that either the Kafk

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