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From "Vinayak Borkar (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-238) ClientRMProtocol needs to allow the specification of a ResourceRequest so that the Application Master's Container can be placed on the specified host
Date Fri, 23 Nov 2012 10:02:59 GMT

    [ https://issues.apache.org/jira/browse/YARN-238?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13503137#comment-13503137
] 

Vinayak Borkar commented on YARN-238:
-------------------------------------

UnmanagedAMLauncher is good enough for debugging. The reason I am asking for this change is
because in our cluster I would like the AM to be launched on a specific host. I am guessing
that the strictness guarantee is possibly violated by Yarn when the cluster is fairly busy
with other jobs. This is not an issue in my case. I would be using Yarn as a launcher in this
cluster for just one application that I would be running.

To give a little more background, I am trying to port Hyracks (which is an alternate dataflow
runtime) to use Yarn as its container launcher. As far as Yarn is concerned, the AM in Hyracks
would be a long running job which in turn handles Hyracks Job requests from Hyracks clients.
The clusters on which I am planning to run Hyracks using Yarn and where I would like the AM
to be scheduled at a specific node, will be dedicated to only running one instance of Hyracks.
In this case, I am hoping that the strictness guarantee is met by Yarn.
                
> ClientRMProtocol needs to allow the specification of a ResourceRequest so that the Application
Master's Container can be placed on the specified host
> -----------------------------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: YARN-238
>                 URL: https://issues.apache.org/jira/browse/YARN-238
>             Project: Hadoop YARN
>          Issue Type: Improvement
>          Components: resourcemanager
>            Reporter: Vinayak Borkar
>
> Currently a client is able to specify only resource requirements in terms of amount of
memory required while launching an ApplicationMaster. There needs to be a way to ask for resources
using a ResourceRequest so that a host name could be specified in addition to the amount of
memory required.

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