You might run into mentioned situation after Hadoop cluster or node reboot. Solution is quite simple: Ambari agent is apparently not running on each node or at all.
Start it with following command:
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ambari-agent start |
In case your are unable to access your Ambari web interface at all (you wouldn’t be able to see previous error, but who am i to judge you), start your Ambari server as well:
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ambari-server start |
Source: Apache Ambari documentation