running this example: ./run-example org.apache.spark.examples.SparkPi yarn-client
I get hadoop errors when using net.topology.node.switch.mapping.impl configuration. This is due to it not including the hadoop classpath so extra things distributed with hadoop and configured won't be picked up.  This might not be a big deal for an initial release as users can always add it.

It might be nice to add an example on how you would run without run-example for when folks write their own code and want to run it.