Have you followed Ambari Upgrade guide, and could you complete all steps without errrors? Ambari upgrade is easy, provided that you had started with a healthy cluster. That's why the very first step of every Ambari upgrade is to inspect the cluster, make sure that all components are running and clear all alerts and warnings. After that back-up all cluster supporting data-bases, and follow these steps: Stop Ambari server and Ambari agents on all hosts Prepare and distribute a new version of ambari.repo to all cluster nodes Upgrade Ambari server (on CentOS/RHEL run yum upgrade ambari-server), confirm it was successful, see Step 6 in the above link. Upgrade Ambari agents on all nodes (yum upgrade ambari-agent), confirm it was successful, see Step 8 in the above link. Upgrade Ambari data-base, run "ambari-server upgrade" "ambari-server start" "ambari-agent start" on all nodes in the cluster All above steps were supposed to complete without errors. Was that so? What you can do now: Repeat Steps 6 and 8 from the guide to make sure you have correct versions of Ambari server and agents Make sure Ambari server is running: ambari-server status Make sure all Ambari agents are running: run "ambari-agent status" on all nodes Open Ambari web UI, if you still have hearbeat lost question marks, then something is wrong with Ambari agents and/or server. Inspect logs for errors: /var/log/ambari-server and /var/log/ambari-agent. Once Ambari is running you can begin starting services: start them one by one, ZooKeeper first, then HDFS, then all the others. Inspect Ambari tasks, and drill down for errors if they fail (red markings). Hope this helps.
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