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Date: Tue, 08 Oct 2013 16:22:15 -0400
From: Tom Beerbower <tbeerbower@hortonworks.com>
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To: ambari-user@incubator.apache.org
Subject: Re: How to update service state on specific hosts?
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Hi Christian,

If I understand correctly you want to set the state of a component on a 
specific host.  If so, here is an example from the docs ...

Start the NAMENODE component by updating its state to 'STARTED'.

PUT api/v1/clusters/c1/hosts/hostname/host_components/NAMENODE

{
   "HostRoles":{
     "state":"STARTED"
   }
}


202 Accepted
{
   "href" : "http://your.ambari.server:8080/api/v1/clusters/c1/requests/12",
   "Requests" : {
     "id" : 12,
     "status" : "InProgress"
   }
}


Thanks,
Tom


On 10/8/13 4:13 PM, Christian Smith wrote:
> Hi,
>
> I have a scenario where I have an existing cluster with all the 
> services installed and started.  I then add one or more slaves to the 
> existing cluster.
>
> I'm wondering if there' s an easy way for me to set the 
> service/component states to INSTALLED then STARTED just for the new 
> hosts?  When installing the cluster I use something like PUT 
> state=INSTALLED to 
> /api/v1/clusters/c1/services?ServiceInfo/state=INIT, but obviously I 
> can't use this on a running cluster.
>
> I've tried various predicates like selecting just the hostnames I need 
> for a component, but the predicate isn't supported.
>
> For example, this fails
>
> /api/v1/clusters/c1/services/HDFS/components/DATANODE?host_components/HostRoles/host_name=my-hostname
>
> I know I can iterate through each host, but this is slow...
>
> Thanks in advance,
> Christian


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