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3: Hadoop Clusters can be created on Virtual Machines. This
works, but performance (especially to virtualized disks) can be
significantly slower than for physical machines. Hadoop Clusters
can be created on Virtual Machines. See [[Virtual Hadoop]] for
the benefits and challenges present in such deployment.  Virtual
Clusters  Hadoop Clusters can be created on Virtual Machines.
See Virtual Hadoop for the benefits and challenges present in
such deployment.  Process to set up a cluster using the Hadoop
shell scripts    1. All machines should be brought up to date,
with the same version of Java, Hadoop, etc.   2. All
machine's(both VM's and physical machines) public key are
distributed to all "~/.ssh/authorized_keys" file.   3.
conf/hadoop-site.xml file is similar for all the ma