I'm trying to read a file on my hdfs server in my python app deployed with docker, during dev, I don't have any problem, but in prod there are this error :
Erreur: HTTPConnectionPool(host='dnode2', port=9864): Max retries exceeded with url: /webhdfs/v1/?op=OPEN&namenoderpcaddress=namenode:9000&offset=0 (Caused by NewConnectionError('<urllib3.connection.HTTPConnection object at 0x7f1af13d45d0>: Failed to establish a new connection: [Errno -2] Name or service not known'))
Note that I use an address IP not that "dnode2" name and neither use that port!!
Sorry, but It was just that I needed to add a static mapping in my /etc/hosts and it's work!!