fsync()-in webdav PUT

[Nagy, Attila]

On 02/27/2018 02:24 PM, Maxim Dounin wrote:
>
>> Now, that nginx supports running threads, are there plans to convert at
>> least DAV PUTs into it's own thread(pool), so make it possible to do
>> non-blocking (from nginx's event loop PoV) fsync on the uploaded file?
> No, there are no such plans.
>
> (Also, trying to do fsync() might not be the best idea even in
> threads.  A reliable server might be a better option.)
>
What do you mean by a reliable server?
I want to make sure when the HTTP operation returns, the file is on the 
disk, not just in a buffer waiting for an indefinite amount of time to 
be flushed.
This is what fsync is for.

Why doing this in a thread is not a good idea? It would'nt block nginx 
that way.