Andrey Zagrebin commented on FLINK-14936:

Ok, as we already have MemoryManager#computeNumberOfPages, I think we can 
quickly add MemoryManager#computeMemorySize for now and create a ticket to 
refactor both methods into LimittingMemoryManager later.

> Introduce MemoryManager#computeMemorySize to calculate managed memory from a 
> fraction
> -------------------------------------------------------------------------------------
>                 Key: FLINK-14936
>                 URL: https://issues.apache.org/jira/browse/FLINK-14936
>             Project: Flink
>          Issue Type: Improvement
>          Components: Runtime / Coordination
>    Affects Versions: 1.10.0
>            Reporter: Zhu Zhu
>            Priority: Major
> A MemoryManager#computeMemorySize(double fraction) is needed to calculate 
> managed memory bytes from a fraction.
> It can be helpful for operators to get the memory size it can reserve and for 
> further #reserveMemory. (Similar to #computeNumberOfPages).
> Here are two cases that may need this method in near future:
> 1. [Python operator memory 
> management|https://lists.apache.org/thread.html/dd4dedeb9354c2ee559cd2f15629c719853915b5efb31a0eafee9361@%3Cdev.flink.apache.org%3E]
> 2. [Statebackend memory 
> management|https://issues.apache.org/jira/browse/FLINK-14883]

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