@Robin Dong Yes of-course you can install Ambari server on Namenode machine, basically if you want you can install everything on single node 🙂 Please check what is purpose of using hadoop, think about volume of input data, how much raw data you want to retain, how much output data you want to retain, what kind of processing you are going to do on Hadoop, what all ecosystems you are planning to use, by considering all these points decide hardware resources and distribute hadoop components amongst nodes in the cluster. Hope this information helps!
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