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4 node cluster configuration

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I'm setting up a 4 node cluster (1x phsical and 3x virtual). The physical machine is to be the master/edge and the 3x VMs are to be the datanodes. My question is when using Ambari 2.5.0.3 "assigning the masters" do I keep everything on the intended master (including the secondary namenode) and only run one zookeeper server/metrics collector/activity analyzer/activity explorer, or do I place the secondary namenode on one of the datanodes along with a zookeeper server/metrics collector/activity analyzer/activity explorer on each of the datanodes?

My intent is to have the physical machine act as the client/edgenode and the VMs to just handle data. Any advice is appreciated.

Thanks in advance.

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This is what I was expecting, but this is what I am given to work with, sadly. Thank you for your input. I am hoping if this build goes well, then I can convence the "powers at be" for a bigger budget to build a proper cluster. Thank you again.