Thanks for the reply - I have tried something similar to this, and tried not sending the "start" call until I saw the "stop" process had completely in the Ambari UI. The weird thing is that the response to the start call isn't an error message like you had predicted - it's just an empty response. It doesn't matter if I don't wait at all or wait 5 minutes, the response is empty. Is there any api call to "restart" so I don't have to manage the timing of stopping, waiting, starting? EDIT: It looks like from here that clients can't be put into any state other than "installed". I'm going to try to use the Restart API as defined here. $ curl --retry 5 --fail -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Starting SPARK_CLIENT"}, "HostRoles": {"state": "STARTED"}}' http://headnodehost:8080/api/v1/clusters/sparkucigraph39/hosts/wn3-sparku.cyzc0onq2zqudhbbi3tes4j3sd.bx.internal.cloudapp.net/host_components/SPARK_CLIENT
HTTP/1.1 200 OK
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
User: sparkadm
Set-Cookie: AMBARISESSIONID=13hxfu6ocnm4oumibnfjle633;Path=/;HttpOnly
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Content-Type: text/plain
Content-Length: 0
Server: Jetty(8.1.17.v20150415)
For comparison, here is the "stop" command: $ curl --retry 5 --fail -u admin:$PASSWORD -i -H 'X-Requested-By: ambari' -X PUT -d '{"RequestInfo": {"context" :"Stopping SPARK_CLIENT"}, "HostRoles": {"state": "INSTALLED"}}' http://headnodehost:8080/api/v1/clusters/sparkucigraph39/hosts/wn3-sparku.cyzc0onq2zqudhbbi3tes4j3sd.bx.internal.cloudapp.net/host_components/SPARK_CLIENT
HTTP/1.1 202 Accepted
X-Frame-Options: DENY
X-XSS-Protection: 1; mode=block
User: sparkadm
Set-Cookie: AMBARISESSIONID=4aelvrdeyd571rpff061lfifd;Path=/;HttpOnly
Expires: Thu, 01 Jan 1970 00:00:00 GMT
Content-Type: text/plain
Vary: Accept-Encoding, User-Agent
Content-Length: 148
Server: Jetty(8.1.17.v20150415)
{
"href" : "http://headnodehost:8080/api/v1/clusters/sparkucigraph39/requests/87",
"Requests" : {
"id" : 87,
"status" : "Accepted"
}
}
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