This solution is works for me on HDP 3.1.4 Ambari 2.7   Thanks for sharing. ... View more

You can try logging into the admin user and restart datanodes from the actions bar in Dashboard. That worked for me. May work for you too. ... View more

@Sunile Manjee - Thanks for the info, I'm aware that we can do this using API, as @John Martin wanted to do this while installing HDP cluster hence suggested to put in configs section of ambari blueprint. ... View more

@Aman Mundra There is not much details why Namenode is failing to start. Can you share the NameNode log when trying to start the namenode service? It will help to identify what is causing the NameNode to fail to start. Meanwhile you can try to test if namenode can be manually started from command line? Run following : /usr/hdp/current/hadoop-client/sbin/hadoop-daemon.sh --config /usr/hdp/current/hadoop-client/conf start namenode or /var/lib/ambari-agent/ambari-sudo.sh su hdfs -l -s /bin/bash -c 'ulimit -c unlimited ;/usr/hdp/current/hadoop-client/sbin/hadoop-daemon.sh --config /usr/hdp/current/hadoop-client/conf start namenode ... View more

Also note, config changes are logged to: /var/log/ambari-server/ambari-config-changes.log ... View more

Hello, Restarting the Standby NameNode did not resolve the issue. Then when trying to restart the Active NameNode Ambari told me to SSH into my Active NameNode server and: Enter Safe Mode sudo su hdfs -l -c 'hdfs dfsadmin -safemode enter' Safe mode is ON in xx.xxx.xxx.xxx:8020 Safe mode is ON in xx.xxx.xxx.xxx:8020 The save Namespace root@xxxxx:~# sudo su hdfs -l -c 'hdfs dfsadmin -saveNamespace' Save namespace successful for xx.xxx.xxx.xxx:8020 Save namespace successful for xx.xxx.xxx.xxx:8020 After that restarting both NameNodes cleared the Alerts. Regards. ... View more

Thanks @Ali Bajwa ... View more

Also, for reference, you can checkout this section of the docs related to Tuning Ambari Metrics (with some guidelines) and how to setup Distributed mode. http://docs.hortonworks.com/HDPDocuments/Ambari-2.2.1.1/bk_ambari_reference_guide/content/ch_amb_ref_configuring_ambari_metrics.html ... View more

You're probably running into https://issues.apache.org/jira/browse/AMBARI-15617 Check to make sure that /var/lib/ambari-agent/tmp does not have "ambari_commons" as a directory/symlink inside of it. If it does, you should remove it. It's probably adding an older version of the common library to your python path. ... View more

I have installed only zookeeper. ... View more