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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