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Date: Fri, 25 Dec 2015 22:34:49 +0000 (UTC)
From: "Karthik Kambatla (JIRA)" <jira@apache.org>
To: yarn-issues@hadoop.apache.org
Message-ID: <JIRA.12910902.1446772557000.8363.1451082889707@Atlassian.JIRA>
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 <JIRA.12910902.1446772557423@arcas>
Subject: [jira] [Commented] (YARN-4335) Allow ResourceRequests to specify
 ExecutionType of a request ask
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    [ https://issues.apache.org/jira/browse/YARN-4335?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15071740#comment-15071740 ] 

Karthik Kambatla commented on YARN-4335:
----------------------------------------

My impression from the offline conversation was the AMs should not need to request a specific ExecutionType. Would like to understand this better: are there any prerequisites for a container to be executed opportunistically? Are there applications that favor guaranteed vs opportunistic execution, and is that bias justified? 

In any case, let us drive YARN-2882 to resolution while we figure these things out. 

> Allow ResourceRequests to specify ExecutionType of a request ask
> ----------------------------------------------------------------
>
>                 Key: YARN-4335
>                 URL: https://issues.apache.org/jira/browse/YARN-4335
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Konstantinos Karanasos
>            Assignee: Konstantinos Karanasos
>         Attachments: YARN-4335-yarn-2877.001.patch
>
>
> YARN-2882 introduced container types that are internal (not user-facing) and are used by the ContainerManager during execution at the NM.
> With this JIRA we are introducing (user-facing) resource request types that are used by the AM to specify the type of the ResourceRequest.
> We will initially support two resource request types: CONSERVATIVE and OPTIMISTIC.
> CONSERVATIVE resource requests will be handed internally to containers of GUARANTEED type, whereas OPTIMISTIC resource requests will be handed to QUEUEABLE containers.


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