Carlo Curino commented on YARN-1039:

I am happy the conversation is re-ignited. As I was mentioning in [above | 
 the "long-lived" tag is a coarse grained version of the notion of "duration" 
we added to the ReservationRequest (which tracks very closely ResourceRequest) 
in YARN-1051. 

The idea is that the AM could provide an estimate of the task duration, 
enabling (beyond what Steve already listed above) optimistic scheduling 
decisions like the one in YARN-2877 very short tasks (we run several 
experiments and the potential for increased utilization is substantial).  Given 
a "duration" parameter, expressing long-lived can be done by setting duration 
to a large value (or MAX_INT, or -1 or whatever convention).

> Add parameter for YARN resource requests to indicate "long lived"
> -----------------------------------------------------------------
>                 Key: YARN-1039
>                 URL: https://issues.apache.org/jira/browse/YARN-1039
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>    Affects Versions: 3.0.0, 2.1.1-beta
>            Reporter: Steve Loughran
>            Assignee: Craig Welch
>         Attachments: YARN-1039.1.patch, YARN-1039.2.patch, YARN-1039.3.patch
> A container request could support a new parameter "long-lived". This could be 
> used by a scheduler that would know not to host the service on a transient 
> (cloud: spot priced) node.
> Schedulers could also decide whether or not to allocate multiple long-lived 
> containers on the same node

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