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Date: Fri, 04 Oct 2013 10:49:43 +0000
From: ADAMOS LOIZOU <adamos@tid.es>
Subject: Reconfiguring services with client only components
To: "ambari-user@incubator.apache.org" <ambari-user@incubator.apache.org>
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Thread-topic: Reconfiguring services with client only components
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Hello,

We use a custom service in our Ambari instance that comprises only of client components (i.e. no daemons).

We used to control its reconfiguration by:

1. Stopping the service by changing the service state to INSTALLED
2. Changing the cluster configuration with a PUT in e.g. http://localhost:8080/api/v1/clusters/mycluster with the following body:
  {
    "Clusters": {
      "desired_configs": {
        "type": "your_custom_service_type",
        "tag": "your_new_version",
        "properties": { }# properties here
      }
    }
  }

3. "Starting" the service by changed the state to STARTED. Even though the service would always remain in INSTALLED state (as being with client-only components) it had the effect of applying the changed configuration.

We've recently synced our Ambari version with the latest from trunk and we no longer see that behaviour (the configuration is not applied).

What would the correct way be of reconfiguring a service with client only components?

Thank you

Kind Regards
Adamos

________________________________

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Hello,
<div><br>
</div>
<div>We use a custom service in our Ambari instance that comprises only of client components (i.e. no daemons).</div>
<div><br>
</div>
<div>We used to control its reconfiguration by:</div>
<div><br>
</div>
<div>1. Stopping the service by changing the service state to <font face="Courier">
INSTALLED</font></div>
<div>2. Changing the cluster configuration with a <font face="Courier">PUT</font> in e.g.
<font face="Courier"><a href="http://localhost:8080/api/v1/clusters/mycluster">http://localhost:8080/api/v1/clusters/mycluster</a>
</font>with the following body:</div>
<div><font face="Courier">&nbsp;&nbsp;{</font></div>
<div><font face="Courier">&nbsp; &nbsp; &quot;Clusters&quot;: {</font></div>
<div><font face="Courier">&nbsp; &nbsp; &nbsp; &quot;desired_configs&quot;: {</font></div>
<div><font face="Courier">&nbsp; &nbsp; &nbsp; &nbsp; &quot;type&quot;: &quot;your_custom_service_type&quot;,</font></div>
<div><font face="Courier">&nbsp; &nbsp; &nbsp; &nbsp; &quot;tag&quot;: &quot;your_new_version&quot;,</font></div>
<div><font face="Courier">&nbsp; &nbsp; &nbsp; &nbsp; &quot;properties&quot;: { }#&nbsp;properties here</font></div>
<div><font face="Courier">&nbsp; &nbsp; &nbsp; }</font></div>
<div><font face="Courier">&nbsp; &nbsp; }</font></div>
<div><font face="Courier">&nbsp; }</font></div>
<div><font face="Courier"><br>
</font></div>
<div>3. &quot;Starting&quot; the service by changed the state to <font face="Courier">STARTED</font>. Even though the service would always remain in
<font face="Courier">INSTALLED</font> state (as being with client-only components) it had the effect of applying the changed configuration.</div>
<div><br>
</div>
<div>We've recently synced our Ambari version with the latest from trunk and we no longer see that behaviour (the configuration is not applied).</div>
<div><br>
</div>
<div>What would the correct way be of reconfiguring a service with client only components?</div>
<div><br>
</div>
<div>Thank you</div>
<div><br>
</div>
<div>Kind Regards</div>
<div>Adamos</div>
<br>
<hr>
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