in our Amabri cluster we see that: all data nodes are up but in dashboard we see only 3 from 5 are up so - how / why dashboard see only 3 from 5 ? what need to check or sync here? * just want to say that two hosts ( workers machine ) was added recently to the ambari cluster , any way we restart the ambari-agent and reboot these servers , but still the status on dasboard is 3/5 ... View more

please advice what is the solution for this problem we are getting this errors ( from the log under /var/lib/ambari-agent/data ) 2017-11-13 11:49:49,056 - Getting jmx metrics from NN failed. URL: http://master01.sys56.com:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem Traceback (most recent call last):ExecutionFailed: Execution of 'curl -s 'http://master01.sys56.com:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem' we also tried this solution but without results: https://community.hortonworks.com/articles/114869/how-to-resolve-namenode-nn1-is-not-listed-as-activ.html and when we try it manual curl -s 'http://master01.sys56:50070/jmx?qry=Hadoop:service=NameNode,name=FSNamesystem' we get echo $? 7 ... View more