Peter Bacsko updated YARN-10168:
    Summary: FS-CS Converter: tool doesn't handle min/max resource conversion 
correctly  (was: FS-CS Convert: Converter tool doesn't handle min/max resource 
conversion correct)

> FS-CS Converter: tool doesn't handle min/max resource conversion correctly
> --------------------------------------------------------------------------
>                 Key: YARN-10168
>                 URL: https://issues.apache.org/jira/browse/YARN-10168
>             Project: Hadoop YARN
>          Issue Type: Sub-task
>            Reporter: Wangda Tan
>            Assignee: Peter Bacsko
>            Priority: Blocker
> Trying to understand logics of convert min and max resource from FS to CS, 
> and found some issues:
> 1)
> In FSQueueConverter#emitMaximumCapacity
> Existing logic in FS is to either specify a maximum percentage for queues 
> against cluster resources. Or, specify an absolute valued maximum resource.
> In the existing FS2CS converter, when a percentage-based maximum resource is 
> specified, the converter takes a global resource from fs2cs CLI, and applies 
> percentages to that. It is not correct since the percentage-based value will 
> get lost, and in the future when cluster resources go up and down, the 
> maximum resource cannot be changed.
> 2)
> The logic to deal with min/weight resource is also questionable:
> The existing fs2cs tool, it takes precedence of percentage over 
> absoluteResource, and could set both to a queue config. See 
> FSQueueConverter.Capacity#toString
> However, in CS, comparing to FS, the weights/min resource is quite different:
> CS use the same queue.capacity to specify both percentage-based or 
> absolute-resource-based configs (Similar to how FS deal with maximum 
> Resource).
>  The capacity defines guaranteed resource, which also impact fairshare of the 
> queue. (The more guaranteed resource a queue has, the larger "pie" the queue 
> can get if there's any additional available resource).
>  In FS, minResource defined the guaranteed resource, and weight defined how 
> much the pie can grow to.
> So to me, in FS, we should pick and choose either weight or minResource to 
> generate CS.
> 3)
> In FS, mix-use of absolute-resource configs (like min/maxResource), and 
> percentage-based (like weight) is allowed. But in CS, it is not allowed. The 
> reason is discussed on YARN-5881, and find [a]Should we support specifying a 
> mix of percentage ...
> The existing fs2cs doesn't handle the issue, which could set mixed absolute 
> resource and percentage-based resources.

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