Yes, I've thought of this but as I understand it there is a bit of a problem attaching a large amount of links to a key which would be necessary here am I right? If I had 10 000 files in riak that would mean 10 000 links attached to the "listing" key.
4 sep 2010 kl. 20.44 skrev Matthew Scott: > > On Sat, Sep 4, 2010 at 11:31, John Axel Eriksson <j...@insane.se> wrote: > Listing keys in a bucket has been described as "bad" and something you use in > development but > not in production. I'm just starting out on Riak so I'm a newbie... > > I'm thinking of building an application using Riak as filestorage and > possibly much more than that, but it would > at least store lots of files with, perhaps, metadata attached. How would I > then list files for display in a webapp if > I don't use key listing? > > I'm still very much a Riak newb myself, but I'll take a shot at answering > this one by suggesting the use of links. > > From what I understand, links some quantity limits when you attach a large > number, but adding and removing them is an inexpensive operation. (Someone > fact check me on that please :) > > - Create a key called 'listing', perhaps even in its own bucket to prevent > namespace collision. > > - Create links from that 'listing' key to metadata keys. Remember that you > can attach a tag to each link to differentiate different types of links, such > as "metadata". > > - The metadata keys' values would contain file metadata in JSON form, and in > turn have a link to the file contents key, tagged "contents". > > - Remember to attach the proper mime type to the key containing your file > contents. > > - To get a file listing, do a map/reduce starting at "listing", following its > "metadata" links and grabbing those values, then reduce to sort by a key. > > - To get file contents, follow the "contents" link from the metadata key. > > -- > Matthew Scott > ElevenCraft, Inc. > http://11craft.com/ > +1 360 389-2512 > >
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