: : I'm interested in FederatedSearch on wiki: : : http://wiki.apache.org/solr/FederatedSearch : : I would like to understand the design concept of this article properly, : and I have some questions:
i think so far that page has just been yonik's scratch pad for ideas, so you may not get any detailed answers to your questions until he gets back from vaction : 1. What does "multi-step" mean? : e.g. : Nice to haves: : Retain ability to have complex *multi-step* query handler plugins i believe that is refering to the ability for a request handler to take two operations using the underlying API, and know that the results of those operations will make sense relative eachother: ie, do a search, get results back, then get facet count info and get numbers that make sense given the results of hte search. : 2. It seems that "consistency" is one of key concept in Complex Federation, : but I don't really understand it. In other words, I don't understand : what inconvenience we will face if the request handler doesn't guarantee : that the view of the index does not change during a single request. consider the example above, you could wind up telling a user that there are 345,678 results for their search, and 876,543 of those results are in the "books" category (if lots of docs get added to the index in the middle of hte request) : 3. Will SolrMultiSearcher have caches? (filter, queryResult, and document) that's like asking if the 2011 Dodge Viper will be a Hybrid-Electic or bio-diesel ... it's just a concept at the moment, with no concrete design or prototype, who knows what it will be. -Hoss
