RE: If This Can Be Done, How?

Wait, I thought by the subject line and subsequent ending sentence, he wanted 
the best way to do this, not specifically make it on
his own for the purpose of making it.

My apologies if that's the case.

Sure, the list follows:

Are you going to use encryption for the data?

If so, what algorithm?

Are you going to use compression?

If so, are you going to change the streaming compression for different file 
types E.G. text compresses very well with lzma 2;
however, I wouldn't even bother doing it on h264 video files.

Are you going to do remote differentials, then compare results?

If you're going to do diffs, what are you going to use? Crc? Md5? Sha? Binary 
diff algos like the recent modification to diff from
Google?

What happens when a transfer is interrupted? Is the system always guaranteed a 
safe state if this happens?

What is your conflict resolution strategy? File x exists on both servers but 
with the same timestamp and different hash values or
file sizes, if you're going super simplistic, what do you do? There are many 
other conflicts in this vane.

Why are you using a different protocol than one natively available on Windows, 
and almost ubiquitously available on Linux E.G.
samba.

Speaking of samba, have you considered traffic chattiness? The back and forth 
could kill your performance.

Is security a concern? File access can get very tricky very fast, so are 
outside users going to use this, or could they potentially
do so?

Speaking of security, how are you handling authentication?

What's the production guarantee of this software. This means, are you wanting 
this thing to be up, no matter what? If so, what steps
are necessary to make that happen ... Is this being used for backups of some 
kind, and if so, how often will you test to make sure
files can transfer the other way?

Speaking of files ... There are issues when going cross platform such as 
permissions and other file system specific bits. Are these
bits, permissions, and ownership information, as well as metadata, going to be 
preserved?

I didn't count them, but ... There you go. That was only a few moments of 
typing, so I'm sure there are other questions as well.

If you're designing this for the heck of it, then good luck: it sounds like a 
super fun project.

Sorry again. I thought you wanted an existing solution.


Take care,
Sina










-----Original Message-----
From: programmingblind-bounce@xxxxxxxxxxxxx 
[mailto:programmingblind-bounce@xxxxxxxxxxxxx] On Behalf Of David Engebretson 
Jr.
Sent: Wednesday, October 06, 2010 11:28 AM
To: programmingblind@xxxxxxxxxxxxx
Subject: Re: If This Can Be Done, How?

Hi Sina,

Could you expand on your thoughts?  You said there were 10 or 20 things Jim 
hadn't thought of.  I'd like to see a list of those...
I'll bet he would as well.

I'm guessing, since he is trying to create the tool on his own, he wants to 
gleam the knowledge of creating said software.

It's nice to have this list to bounce ideas off of people who are more 
knowledgable than us, a?

Cheers,
D

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