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Ambari Server: Check /var/log/ambari-server/ambari-server.log for errors.
Ambari Agent: Check /var/log/ambari-agent/ambari-agent.log for errors.

Installing a new cluster on top of an existing cluster

When installing a Hadoop cluster via Ambari on hosts that already have Hadoop bits installed (including an existing cluster deployed via Ambari), perform the following:

  • Stop all the services on all the nodes(including ganglia and nagios)
  • It is also a good practice to delete the rpms from all nodes.

search for the rpms:
rpm -qa | grep ganglia
rpm -qa | grep oozie
rpm -qa | grep sqoop
rpm -qa | grep pig
rpm -qa | grep nagios
rpm -qa | grep hadoop

and remove them :
rpm -e <package name>

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