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I want to use one machine as a namenode, another machine as a datanode. After configuration, I can find datanode by using "jps" command. But I cant find the datanode when using "hdfs dfsadmin -report" on any of these two machines. So what's wrong? Can two machines not be used for hadoop cluster, and at lease 3 machines?

OneCricketeer
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Chris
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    yes you can, check if data nodes daemons are working correctly or not! you can run all the master services on machine 1 and all the rest services on machine 2 – Rijul Feb 21 '18 at 06:51
  • You could also have both be datanodes. But you will always need at least one namenode – OneCricketeer Feb 21 '18 at 06:52

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