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From "Karthik Kambatla (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (YARN-2883) Queuing of container requests in the NM
Date Sun, 27 Mar 2016 00:13:25 GMT

    [ https://issues.apache.org/jira/browse/YARN-2883?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15213264#comment-15213264
] 

Karthik Kambatla commented on YARN-2883:
----------------------------------------

Took a closer look at the patch. I am a little confused, very likely due to the javadoc comments.
More high-level comments:
# In case of guaranteed containers, {{ContainerManagerImpl}} receives and launches the containers,
and eventually handles the monitoring task to {{ContainersMonitorImpl}}. Using {{ContainerStopMonitoringEvent}}
to figure out when to start the next queued container seems confusing. Is there no other way
around this? How about having {{ContainerImpl#sendFinishedEvents}} notify {{ContainerManagerImpl}}
so it can consider launching a queued container?
# {{ContainerManagerImpl}} starts containers synchronously, without any events. I would expect
{{QueuingContainerManagerImpl}} to queue containers the same way - synchronously. That would
save us one set of event and event-type 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-trunk.004.patch, YARN-2883-trunk.005.patch, YARN-2883-trunk.006.patch,
YARN-2883-yarn-2877.001.patch, YARN-2883-yarn-2877.002.patch, YARN-2883-yarn-2877.003.patch,
YARN-2883-yarn-2877.004.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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