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From Jayush Luniya <jlun...@hortonworks.com>
Subject Re: Run Service Check on a certain node
Date Thu, 24 Mar 2016 17:57:41 GMT
Is there a specific reason that the Service Check needs to run on the Master. It is actually
better if the service check runs on a random host that has the Client component for the service
installed so that you know that the service can be reached from non-master node.

Thanks
Jayush

From: Sumit Mohanty <smohanty@hortonworks.com<mailto:smohanty@hortonworks.com>>
Reply-To: "user@ambari.apache.org<mailto:user@ambari.apache.org>" <user@ambari.apache.org<mailto:user@ambari.apache.org>>
Date: Tuesday, March 22, 2016 at 12:45 PM
To: "user@ambari.apache.org<mailto:user@ambari.apache.org>" <user@ambari.apache.org<mailto:user@ambari.apache.org>>
Subject: Re: Run Service Check on a certain node


I believe this is the logic - https://github.com/apache/ambari/blob/d2ccdcaa44350000c15c6559c405383c12aac5ae/ambari-server/src/main/java/org/apache/ambari/server/controller/AmbariCustomCommandExecutionHelper.java#L461‚Äč

________________________________
From: Pei Heng Zeng <wadephz@gmail.com<mailto:wadephz@gmail.com>>
Sent: Tuesday, March 22, 2016 11:42 AM
To: user@ambari.apache.org<mailto:user@ambari.apache.org>
Subject: Re: Run Service Check on a certain node

Hi Sumit,

Thanks for replying.

My service has both Master and Client. The Master itself is also a client. Is there some logic
behind which node Ambari picks to run the Service Check?

Thanks

On Tue, Mar 22, 2016 at 11:36 AM, Sumit Mohanty <smohanty@hortonworks.com<mailto:smohanty@hortonworks.com>>
wrote:

I thought the Service Check is only run on CLIENT components associated with the Service.
However, if there are no CLIENT components then it may be picking up any host that has any
component. Does your service only has a MASTER component?

________________________________
From: Pei Heng Zeng <wadephz@gmail.com<mailto:wadephz@gmail.com>>
Sent: Tuesday, March 22, 2016 11:32 AM
To: user@ambari.apache.org<mailto:user@ambari.apache.org>
Subject: Run Service Check on a certain node

Hi,

I am trying to implement a Service Check feature for a custom service in Ambari. I am running
into a problem where I have no control over which node the Service Check is run on. This is
a problem because the Service Check is only designed to run on the node where the Master of
the service resides. If the Master happens to be on the node that Ambari picks to run the
Service Check, then the Service Check will run properly. Otherwise, it will basically be a
no-op.

Did anyone else run into similar issues?

Your response is greatly appreciated.

Sincerely,

Pei Heng Zeng

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