Incorrect configuration: namenode address dfs.namenode.rpc-address is not configured

Question

I am getting this error when I try and boot up a DataNode. From what I have read, the RPC paramters are only used for a HA configuration, which I am not setting up (I think)

Answer 1

in my case, I have wrongly set HADOOP_CONF_DIR to an other Hadoop installation.

Add to hadoop-env.sh:

export HADOOP_CONF_DIR=/usr/local/hadoop/etc/hadoop/