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From "Arun Suresh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2883) Queuing of container requests in the NM
Date Mon, 29 Feb 2016 18:07:18 GMT

    [ https://issues.apache.org/jira/browse/YARN-2883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15172264#comment-15172264

Arun Suresh commented on YARN-2883:

On going thru the patch again, I feel a better (and safer) way to introduce the changes is

* to extend both the {{ContainerManagerImpl}} and the {{ContainersMonitorImpl}} classes into
two new subclasses {{QueuedContainerManager}} and {{QueuedContainersManager}}
* Then we can move all the required data structures (all the new collections) as well as the
Event Handlers into the new classes.
* We can also get rid of all the {{if context.isDistributedSchedulingEnabled()}} checks. Since
we would need to do it only once in the {{NodeManager}} when we create the instance of the
* We can also reason about the code flow better since we the changes would be isolated to
the new classes.

> Queuing of container requests in the NM
> ---------------------------------------
>                 Key: YARN-2883
>                 URL: https://issues.apache.org/jira/browse/YARN-2883
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: nodemanager, resourcemanager
>            Reporter: Konstantinos Karanasos
>            Assignee: Konstantinos Karanasos
>         Attachments: YARN-2883-yarn-2877.001.patch
> We propose to add a queue in each NM, where queueable container requests can be held.
> Based on the available resources in the node and the containers in the queue, the NM
will decide when to allow the execution of a queued container.
> In order to ensure the instantaneous start of a guaranteed-start container, the NM may
decide to pre-empt/kill running queueable containers.

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