Scenario: Apache Ambari UI shows down hosts and services in Azure HDInsight
This article describes troubleshooting steps and possible resolutions for issues when interacting with Azure HDInsight clusters.
Apache Ambari UI is accessible, but the UI shows almost all services are down, all hosts showing heartbeat lost.
In most scenarios, this is an issue with Ambari server not running on the active headnode. Check which headnode is the active headnode and make sure your ambari-server runs on the right one. Don't manually start ambari-server, let failover controller service be responsible for starting ambari-server on the right headnode. Reboot the active headnode to force a failover.
Networking issues can also cause this problem. From each cluster node, see if you can ping
headnodehost. There is a rare situation where no cluster node can connect to
$>telnet headnodehost 8440 ... No route to host
Usually rebooting the active headnode will mitigate this issue. If not please contact HDInsight support team.
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