nice_furniture

Syncing only modified chunks in big files?

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Ok, I found this interesting thread: :

"Sync splits file to 4Mb chunks, if one chunk was changed - it will be transferred. It works well on files that doesn't change the size, for example TrueCrypt volume.

If you add one byte in front of the file, all chunks will be shifted and Sync will not be able to detect shifted data."

So it seems, Sync has to transfer the whole file all over someone adds something and so changes the file size.

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Specifically, only if the changes are early in the file. If they're late in the file or simply appending to the file, only the last chunk and any changed chunks would need to be (re-)downloaded

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Thanks!

On 5/29/2013 at 2:35 PM, nice_furniture said:

Ok, I found this interesting thread:

:

 

"Sync splits file to 4Mb chunks, if one chunk was changed - it will be transferred. It works well on files that doesn't change the size, for example TrueCrypt volume.

 

If you add one byte in front of the file, all chunks will be shifted and Sync will not be able to detect shifted data."

So it seems, Sync has to transfer the whole file all over someone adds something and so changes the file size.

 

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