Yes - on Sync Gw startup it will process the shadowed bucket's history and 
copy the data over to the 'sync gw' bucket.  

This is covered in the documentation here 
<http://developer.couchbase.com/mobile/develop/guides/sync-gateway/wcbs/bucket-shadowing/index.html#configuration>.
 
 Relevant excerpt:

>
> When you start the Sync Gateway, it will run through the app bucket's 
> history (also known as its TAP feed), copying any new or changed documents 
> into the gateway database. Depending on how large the bucket is, this may 
> take a while. Unfortunately there's no way to bypass this on subsequent 
> launches of the Sync Gateway, due to limitations of the TAP feed 
> implementation.


 When the documentation refers to 'copying any new or changed documents' 
above, it means any documents that are 'new or changed' from the SG 
bucket's perspective - it's processing the entire shadowed bucket's TAP 
feed.

- Adam

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