[GitHub] kocolosk commented on issue #831: Filter _changes by key to speed up replication

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kocolosk commented on issue #831: Filter _changes by key to speed up replication
URL: https://github.com/apache/couchdb/issues/831#issuecomment-332374432
 
 
   @redgeoff the trick is that replication needs to be incrementally resumable, so if you want to build an index to drive filtered replication the server also needs to maintain a second internal index to get a list of all the changed and deleted keys in that index since your last request. Hopefully that makes sense. That's the PR @nickva pointed you to, although as @eiri mentioned it's not currently functional.
   
   You're certainly right that the normal `_view` API uses a dedicated index and is quite fast, but in the default configuration a view has no way to efficiently deliver you a subset of recently changed rows.
 
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