The following change should have a big impact (I hope):
- client: changed file upload logic
Old: each upload attempt consists of two HTTP requests:
the 1st to get the current file size on server,
the 2nd to upload the remainder of the file.
Problem:
a) if the upload server is overloaded and requests
are succeeding with probability X,
then the chance of both requests succeeding is X^2.
So e.g. a per-request success rate of 0.1
becomes an overall success rate of 0.01.
b) the "get file size" request can be avoided in some cases.
New:
If we've already queried the file size
and haven't uploaded any additional bytes,
don't query the file size again.
client/
pers_file_xfer.cpp
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