I've upgraded Cloudera Manager from 5.7.0 to 5.9. The upgrade was done smoothly without any error. But then I couldn't upgrade CDH to 5.9. The parcels distributed but the the services can't be started.   I realized that all clouder-scm-agent services are stopped. I went through the logs, and found that the agent can't communicate with supervisord. The error is Protocol Error: 401 Unauthorized.   I found there's a supervisord.conf file in /run/cloudera-scm-agent/supervisord . It seems that it is generated automatically by the agent process. In the file, it's mentioned that the server is on http://127.0.0.1:19001 and it requires username & password(which I found that they're generated with random numbers). The odd thing here is that I can't login the supervisorctl interface with those username and password, neither in the browser and nor with commandline. It seems that although there's a config file for supervisord, the process doesn't use it or there are other problems which prevents the supervisord process to accept those credentials.   I even tried to re-install the agent and daemon but the problem is still there.   Does anybody have an idea?   ... View more