3.5. Problem: HDFS Smoke Test Fails

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

Make sure that reverse DNS look-up is properly configured for all nodes in your cluster.
Make sure you have the correct FQDNs when specifying the hosts for your cluster. Do not use IP addresses - they are not supported.

Restart the installation process.