YOKOHAMA

Experimenting with CouchDB & map/reduce. As a sample app I'm doing some stats analysis on really lame data.

If you're interested, here's how to get started where I left off (make sure you've got CouchDB running):

1. Goto ./bin and edit config.source to check the general configuration vars (should be ok)
2. Run ./setup.sh - this will:
   1. Create the database
   2. Post the files in sample-documents to it
   3. Overwrite the analytics.json design in the database in order to query the data
   4. Upload files in _attachments/* as attachments to _design/analytics
3. Go to Futon at http://127.0.0.1:5984/_utils and check the available data
4. Check the views in the top-right drop down menu, there should be a list of 5 custom views under the "analytics" heading. They should return some random collected data based on whatever you provided in "sample-documents".
5. Check http://127.0.0.1:5984/yokohama/_design/analytics/_view/browsers_versions?group=true for the regular JSON output. Replace browsers_versions with one of the other views listed in the drop down menu. Not exactly clear on what "group=true" is needed for but it's explained here
6. If you're feeling very brave then run stress-upload.sh in bin for a while. It's a while true loop doing upload-sample-documents.sh.

Some things I've noticed

• Coding javascript in JSON sucks, I now understand why couchapp exists.
• Map/Reduce starts to make more sense after reading http://labs.mudynamics.com/wp-content/uploads/2009/04/icouch.html
• CouchDB is hungry for diskspace. Compacting removes old revisions & all deleted documents. It reduced my db from 42 megs to 6 megs.
• It'll stay confusing for quite a while.