On Thu, Feb 26, 2009 at 9:47 AM, Paul Davis <[email protected]> wrote: > On Thu, Feb 26, 2009 at 8:42 AM, Jeff Hinrichs - DM&T > <[email protected]> wrote: >> On Thu, Feb 26, 2009 at 3:56 AM, Jan Lehnardt <[email protected]> wrote: >>> >>> On 26 Feb 2009, at 09:03, Brian Candler wrote: >>> >>>> On Wed, Feb 25, 2009 at 07:07:11AM -0600, Jeff Hinrichs - DM&T wrote: >>>>>> >>>>>> CouchDB dodges this at present, since you can't download a document >>>>>> together >>>>>> with its attachments. >>>>> >>>>> what about ?attachments=true or am I misunderstanding you? >>>> >>>> This is new to me - such feature doesn't seem to be mentioned at >>>> http://wiki.apache.org/couchdb/HTTP_Document_API, where it says: >>>> >>>> "When retrieving documents, the attachment's actual data is not included, >>>> only the metadata. The actual data has to be fetched separately, using a >>>> special URI." >>>> >>>> However I do see "attachments=true" in couch_rep.erl. Is this something >>>> internal/private for replication? >>> >>> This is an omission in the documentation. I added it to the wiki now with >>> a note that you should not use it :) I think the plan forward is to add an >>> API >>> where documents and attachments can be transferred in a single HTTP >>> request using a multipart mime request. This will speed up replication, >> Not immediately apparent that this is true, only if mime encode/decode >> is faster than json encode/decode >> > > The major speed up factors when doing this in multipart mime are: > > 1. Streaming bytes from and to disk for attachments. > 2. No Base64 round trip > 3. No base64 means less data transferred > > Seems like I'm missing another one, but those are the biggies.
I knew there had to be more to it than what I was understanding. Any chance you could point me to a reference for multipart mime requests? I ran a goog this morning but ended up with lots of email oriented hits. > HTH, > Paul Davis > >>> fix handling replication with large attachments and makes it possible to >>> create a document and a set of attachments without going through >>> intermediate revisions. >> I am doing this currently, the recent fix to mochiweb of the 1MB body >> regression allows one to upload document + attachments in a single >> revision -- you need to base64 the attachment and set the attributes, >> but it works. My dump/load code does it quite nicely. >>> >> >> Regards, >> >> Jeff Hinrichs >> > Regards, Jeff
