Hi Chris,
2008/9/14 Chris Anderson <[EMAIL PROTECTED]>: > You're correct that CouchDB does not currently support chained > map-reduce jobs. This is because the incremental update feature (where > only changes to the database have to be taken into account between > queries to the view) doesn't have a facility to expire view-rows that > are attached to original documents only through another map/reduce > job. OK. Thank you for your information. There is another Erlang based project handling map/reduce data mining called Disco (http://discoproject.org/). It does not ship a database but perhaps it is possible to use CouchDB as data input for Disco? Does anybody know? > Group_level examples are available in the CouchDB unit tests (see reduce): > http://svn.apache.org/repos/asf/incubator/couchdb/trunk/share/www/script/couch_tests.js > > There is also some example code from me that uses group_level: > http://jchris.mfdz.com/code/2008/6/markov_chains_using_couchdb_s_g Thank you for your links. Since using map/reduce for data mining and clustering is still a bit scary to me and CouchDB tought me the real advantadge of m/r even in a not chained way, I think I will continue read documentation and code. Thank you very much for your help so far! Kind regards Hendrijk
