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Old 05-16-2005, 03:51 AM   #1
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Registered: Apr 2005
Distribution: Debian Sarge, Gentoo
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Download buffer

I couldn't think of a better subject for this, but here's basically what I am trying to do: Machine A is downloading a file from a source that Machine B cannot access. I would then like Machine B to start downloading the file from Machine A while Machine A is still downloading it from a different source.

For this problem, can assume that Machine A is downloading the file in normal sequence. That is, Machine A simply keeps appending data to the file. Also, if the total final size of the file is unknown, can assume that Machine B can be stopped manually when the user knows that the file is done. A key point is to not think of this as trying to get a file from the other source to Machine B as quickly as possible, but rather as getting the file from the other source to Machine A as quick as possible and getting the file from Machine A to Machine B as soon as possible. That is to say:
1.) Machine A can start downloading the file an arbitrary amount of time before Machine B starts downloading.
2.) Machine A should continue downloading from the other source regardless of whether Machine B is downloading from Machine A.
3.) If the transfer between Machine A and Machine B stops, it can be resumed.

So far, everything I've tried only transfers the partial file up to the point where Machine A had already downloaded when the transfer from A to B was started.

Last edited by SDraconis; 05-16-2005 at 04:26 AM.
Old 05-16-2005, 04:28 PM   #2
Registered: Oct 2004
Posts: 42

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Not sure what you want to accomplish. Maybe p2p programs are good direction. BitTorrent for example.
Old 05-16-2005, 07:06 PM   #3
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BitTorrent would definetely not work for my purposes, as the other source could theoretically be transferring using any means, not specifically BT. Here's an example to illustrate: Suppose Machine A has another NIC (not the one used to connect to Machine B) which is connected to another network. I basically want to download a file from somewhere on that network to both Machine A and Machine B. A proxy server on Machine A would not work for this, as the intent is basically to get the file on both systems. Furthermore, I have reasons for not wanting/not being able to allow Machine B any access to that private network, so Machine B has to get the file from Machine A. The current solution is to wait for Machine A to finish downloading, then start the transfer to Machine B. What I want to do is start the transfer from Machine A to Machine B while Machine A is still downloading so Machine B does not have to wait.


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