below is one example - https://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.0/bk_upgrading_hdp_manually/content/start-hadoop-20.html Warning Before you start HDFS on an HA system you must start the ZooKeeper service. If you do not start the ZKFC, there can be failures. ... View more

@Phil G Can you make sure you have property in hdfs-site.xml - "dfs.web.authentication.kerberos.principal" and set to right value Pls refer - http://docs.hortonworks.com/HDPDocuments/HDP2/HDP-2.3.0/bk_hdfs_admin_tools/content/ch11.html ... View more

@Nilesh From the resource manager UI i see there are no "Active Nodes" running and hence the "Total Memory" in UI is displaying 0. Can you check if your node managers are UP and communicating to RM. ... View more

@Nilesh I will suggest yo revisit your yarn memory configuration once. Seems you might be running out of memory. Can you please let me know what values you have set for yarn.scheduler.capacity.maximum-am-resource-percent ? If possible please attach - 1. Yarn RM UI snap 2. yarn-site.xml 3. mapred-site.xml 4. Scheduler snap from RM UI - http://<RM-Hostname>:8088/cluster/scheduler ... View more

@Davide Isoardi I am using same version of ambari and able to see - Click on "Manage Versions" Click on "Register Version" Can you confirm once ? ... View more

@jabir ahmed I think there is no api for ambari-agent health checkup - only you can see agent installation status using ambari api as mentioned - https://cwiki.apache.org/confluence/display/AMBARI/Installing+ambari-agent+on+target+hosts You might need to write custom script for the same. Monitoring tools like nagios can track this. ... View more

@Roberto Sancho I see the alert as WARNING which should not create a problem. Is it possible to attach full log ? Also what is the error while you issue ambari upgrade ? Please send logs also. ... View more

@Amit Sharma Can you check if iptables and selinux is stop. ... View more