Page History

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curl --user admin:admin -i -X GET http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9/tasks/101
curl --user admin:admin -i -X GET http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9/tasks/101

{
  "href" : "http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9/tasks/101",
  "Tasks" : {
    ...
    "status" : "COMPLETED",
    ...
  }
}

...

curl -u admin:admin http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/requests/9?fields=tasks/Tasks/*

6. Start the components.
This step will create requests that you can monitor for progress and result. Start the components after install has been successful.

curl --user admin:admin -i -X PUT -d '{"HostRoles": {"state": "STARTED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/GANGLIA_MONITOR
curl --user admin:admin -i -X PUT -d '{"HostRoles": {"state": "STARTED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/hosts/NEW_HOST_ADDED/host_components/DATANODE

Each install request will return a request id that can be used to monitor progress.
Client components, such as HDFS_CLIENT, need not be started. Nagios server may need to be restarted to ensure it picks up the new host and reports its status.