Karthik Kambatla commented on YARN-4056:

Is this similar to {{assignMultiple}} in {{FairScheduler}}?

> Bundling: Searching for multiple containers in a single pass over {queues, 
> applications, priorities}
> ----------------------------------------------------------------------------------------------------
>                 Key: YARN-4056
>                 URL: https://issues.apache.org/jira/browse/YARN-4056
>             Project: Hadoop YARN
>          Issue Type: New Feature
>          Components: capacityscheduler, resourcemanager, scheduler
>            Reporter: Srikanth Kandula
>            Assignee: Robert Grandl
>         Attachments: bundling.docx
> More than one container is allocated on many NM heartbeats. Yet, the current 
> scheduler allocates exactly one container per iteration over {{queues, 
> applications, priorities}}. When there are many queues, applications, or 
> priorities allocating only one container per iteration can  needlessly 
> increase the duration of the NM heartbeat.
> In this JIRA, we propose bundling. That is, allow arbitrarily many containers 
> to be allocated in a single iteration over {{queues, applications and 
> priorities}}.

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