Re: [Wget-dev] wget2 | Preallocate file before starting downloading (#450)

[Andrey Gursky]

Receiving file creation requests FS has no clue, how big the files will be and 
where it is the best to place them. Perhaps some heuristics try to workaround 
this. But not ignoring the information from web server about the file size and 
forwarding this hint to FS should allow it to perform at the best level.

Indeed, preallocation would be a problem for systems encountering really hard 
failures often. I'd say this looks like an exception, which occurs very rarely.

(Personally only if I save file to a network FS with a bad connection I may 
have to use SIGKILL instead of usual SIGTERM, but in such cases true 
preallocation would be likely not supported at all. In opposite I encounter 
really too often cases where files with constant size are served only in chunks 
making continue impossible.)

But if from your experience the most cases of wget2 usage end in a such 
scenario, then `--preallocate` could be a non-default option. Anyway making 
this option default or not is perhaps another issue.

Just for example, Firefox and youtube-dl create temporary files (like ".part") 
for state tracking.

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