Normally, when you start the master, the slaves should also be started
automatically. This, however, presupposes that you've configured the slaves.
In the $SPARK_HOME/conf directory there should be a slaves or
slaves.template file. If it only contains localhost, then you have not set
up any worker nodes.

Also note that SSH from the master to the slaves must be enabled for the
user that runs the Thrift server.



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