If your DataNodes are incorrectly configured, the smoke tests fail and you get this error message in the DataNode logs::
DisallowedDataNodeException org.apache.hadoop.hdfs.server.protocol.DisallowedDatanodeException
Solution:
Ensure that reverse DNS look-up is properly configured.
Ensure that the DataNodes are correctly specified in the
nodesfile (located here:master-install-location/gsInstaller)).Restart the installation process.
