Moved/Renamed Files

[Boris Toloknov]

Ming Zhang wrote:
> On Thu, 2008-01-03 at 20:19 -0500, Boris Toloknov wrote:
>   
>> Hi,
>> It seems that rsync transfers files whose names was changed or which
>> were moved to another directory since the previous synchronization. I
>> think that ability not to transfer (large) files which are present on
>> another computer would be very helpful. Right before rsync is going to
>> transfer some large file it could check if there some other files with
>> the same size ( and maybe the same mtime ) on the destination
>> computer. In case if the destination computer has such files then it
>> could be asked to find the file with given MD5. If it's found then
>> there is no need to transfer that file. Local copy/rename/move can be
>> performed instead.
>>     
>
> let us say you have N files in one directory and you rename the
> directory name. so for N files, u need to check destination side all M
> files and see if it is the renamed one. so you do NxM comparison and
> this is not scalable at all...
>   
I think that a hash could be used instead of that. The destination 
computer ( at least ) must has a list of all the files in the 
destination directory. The key = size + mtime and value = pointer to the 
file entry in the list. Actually for that operation it would be better 
to have that list and hash on the sending computer.

Boris
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