Jian He commented on YARN-2017:

bq. Since this is original logic of SchedulerNode, I think it's better to throw 
exception instead of print a irresponsible log here. Null object passed in 
should be considered big problem in scheduler. And several following places in 
this class.
On a second thought, user might pass in a resource request with null 
capability. I would prefer not changing it. In fact, we can add many other null 
checks in many places. Changed the patch back.

> Merge some of the common lib code in schedulers
> -----------------------------------------------
>                 Key: YARN-2017
>                 URL: https://issues.apache.org/jira/browse/YARN-2017
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>          Components: resourcemanager
>            Reporter: Jian He
>            Assignee: Jian He
>         Attachments: YARN-2017.1.patch, YARN-2017.2.patch, YARN-2017.3.patch
> A bunch of same code is repeated among schedulers, e.g:  between 
> FicaSchedulerNode and FSSchedulerNode. It's good to merge and share them in a 
> common base.

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