Karthik Kambatla commented on YARN-2225:

According to your compatibility guide, "The default values of Hadoop-defined 
properties can be changed across minor/major releases, but will remain the same 
across point releases within a minor release."

So, in letter, we can't target 2.4.1 or 2.5.1, but can target 2.5 or 2.6. In 
spirit, virtual memory check has been a pain and we end up recommending users 
to turn it off. 

> Turn the virtual memory check to be off by default
> --------------------------------------------------
>                 Key: YARN-2225
>                 URL: https://issues.apache.org/jira/browse/YARN-2225
>             Project: Hadoop YARN
>          Issue Type: Bug
>            Reporter: Anubhav Dhoot
>            Assignee: Anubhav Dhoot
>         Attachments: YARN-2225.patch
> The virtual memory check may not be the best way to isolate applications. 
> Virtual memory is not the constrained resource. It would be better if we 
> limit the swapping of the task using swapiness instead. This patch will turn 
> this DEFAULT_NM_VMEM_CHECK_ENABLED off by default and let users turn it on if 
> they need to.

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