Github user davisp commented on the pull request:
https://github.com/apache/couchdb-couch/pull/24#issuecomment-69077741
For posterity, we were trying to make this work without requiring an
on-disk format change but sadly that appears to not be possible due to the lack
of information available when updating documents. Given the lack of information
we can't tell if an attachment that's being updated or deleted needs to be
counted in active_size.
The proper fix for this will be to add a new index to each database that
contains the attachment data. Given the merge work we're going to delay this
until later. Also if/when we get back to this we'll also want to investigate
having attachment data stored in a separate file which would remove a lot of
the gymnastics we have around couch_file:make_blocks and friends.
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