ThomasMarquardt commented on pull request #2584:
URL: https://github.com/apache/hadoop/pull/2584#issuecomment-761600086


   OK, so must() has already shipped, in that case sure, it should stay.  I 
still have a question.  If I pass an option via must(), can it be ignored by 
the implementation?  I read your documentation, specifically, "This means that 
it is not a requirement for the stores to actually read the the read policy or 
file length values and use them when opening files."  To me, this says that 
options passed via must() can be ignored.  If this is true, then what is the 
difference between must() and opt()?  Is it that must() can result in an 
unsupported exception, but opt() never results in an unsupported exception?


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