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curl --user admin:admin -i -X PUT -d '{"RequestInfo": {"context": "Stop HDFS"}, "ServiceInfo": {"state": "INSTALLED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/services/HDFS
curl --user admin:admin -i -X PUT -d '{"RequestInfo": {"context": "Start HDFS"}, "ServiceInfo": {"state": "STARTED"}}' http://AMBARI_SERVER_HOST:8080/api/v1/clusters/CLUSTER_NAME/services/HDFS

Edit configuration using configs.py

configs.py is a helper script available with ambari-server installation that makes it easy to manipulate configuration. When using the script it will edit the configuration and apply it to cluster. You still need to restart services/components for the config to take effect.

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Edit configuration using APIs (1.4.1/1.2.5)

Verified against releases 1.4.1/1.2.5

Starting 1.4.2/1.4.3 you will have to add -H option to the curl calls. E.g. -H "X-Requested-By: ambari"

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