Hadoop on MAC pseudo node : nodename nor servname provided, or not known

You can fix this with a simple command:

echo "127.0.0.1 $HOSTNAME" | sudo tee -a /etc/hosts

(Source)

The problem was with the host file. Fixed it by adding this to the /etc/hosts file:

127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
127.0.1.1   <hostname>

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