Hi, This "search across multiple collections" question has come up a few times recently:
http://search-lucene.com/m/2Q1BE0IT4Y/&subj=Search+across+multiple+collections http://search-lucene.com/m/5JQrXIyhQQ1/&subj=Querying+multiple+collections+in+SolrCloud One important variation of this Q is - can one search across MULTIPLE IDENTICAL collections. The use case is that you need to index/archive a lot of data, but because your searches have a time range filter, instead of having 1 massive Collection you have to search, you really want to have N smaller Collection, say weekly, so you can search smaller Collection(s). For example: A query that limits matches to docs from only the last 48 hours can be routed only to the Collection for the latest/current week. If the time range filter needs data from multiple Collections (e.g. it's for the last 10 days and we have weekly collections), then IDEALLY, you want to be able to send ONE request to Solr and specify 2 Collections to search and have Solr handle calling each Collection and merging. Yes, in case of full-text search global IDF would ideally be used, but Solr is increasingly used for analytical queries and not just full-text queries, and one doesn't need global IDF for that. So: Can one query *multiple identical* Collections with one request from the client? If not: should I open a new JIRA issue? I see https://issues.apache.org/jira/browse/SOLR-4497 allows aliasing multiple Collections, which covers the use-case where you know which Collections might be queried. But in some cases you don't know that ahead of time, so you can't prepare all the aliases. In that case you wold want to be able to list all Collections to search in the request and that's it. Maybe this is already doable? Thanks, Otis -- Solr & ElasticSearch Support -- http://sematext.com/ Performance Monitoring -- http://sematext.com/spm
