Streaming simultaneously can result in all kinds of problems due
differences in speed and reliablility between a disk and network
connection. So if you can, buffer the data for the write to S3. Maybe you
could just stream to S3 from the file after you've written it?
If you must stream simultaneously, don't try any magic with
pipedinputstream. Just use:
(with-open [in (open-input)
file (open-file)
s3 (open-s3)]
(copy-multi in [file s3]))
And beware that if someone pulls the network plug during the operation, the
file will not be fully written either.
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