how to check that all datanode are up by REST API

[#1]

we have ambari cluster ( HDP version 2.6.4 )

how to check that all datanode components ( HDFS ) are up by REST API ?

[#2 · Accepted solution]

@Michael Bronson
Following API call will tell us how many DataNodes are live.

# curl -H "X-Requested-By: ambari" -u admin:admin -X GET  http://newhwx1.example.com:8080/api/v1/clusters/NewCluster/services/HDFS/components/DATANODE?fields=...

"started_count": Shows the live (running) DataNodes.
"total_count" : Shows how many DataNodes are there in the cluster.


In order to find out the Individual DataNode Status you will need to supply the hostnames where the DataNodes are installed in the following API call.

#  curl -H "X-Requested-By: ambari" -u admin:admin -X GET http://newhwx1.example.com:8080/api/v1/clusters/NewCluster/hosts/newhwx4.example.com/host_components...

(OR other host)

# curl -H "X-Requested-By: ambari" -u admin:admin -X GET http://newhwx1.example.com:8080/api/v1/clusters/NewCluster/hosts/newhwx1.example.com/host_components...