Re: [PATCH RFC v12 3/3] nfsd: Initial implementation of NFSv4 Courteous Server

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> On Feb 10, 2022, at 11:32 AM, J. Bruce Fields <bfields@xxxxxxxxxxxx> wrote:
> 
> I was standing in the shower thinking....
> 
> We're now removing the persistent client record early, after the first
> lease period expires, instead of waiting till the first lock conflict.
> 
> That simplifies conflict handling.
> 
> It also means that all clients lose their locks any time a crash or
> reboot is preceded by a network partition of longer than a lease period.
> 
> Which is what happens currently, so it's no regression.
> 
> Still, I think it will be a common case that it would be nice to handle:
> there's a network problem, and as a later consequence of the problem or
> perhaps a part of addressing it, the server gets rebooted.  There's no
> real reason to prevent clients recovering in that case.
> 
> Seems likely enough that it would be worth a little extra complexity in
> the code that handles conflicts.
> 
> So I'm no longer convinced that it's a good tradeoff to remove the
> persistent client record early.

Would it be OK if we make this change after the current work is merged?


--
Chuck Lever







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