Agree with everything you said.
-----Original Message----- From: Uri Boness [mailto:ubon...@gmail.com] Sent: 22 January 2010 01:25 To: solr-user@lucene.apache.org Subject: Re: Solr vs. Compass > > There seems to be an implication that compass wont scale as well as solr - and I'm not sure that's true at all. They will both scale as well as the underlying Lucene. Lucene doesn't handle distributed search or replication out of the box, you have to implement it using some of it's features (deletion policy, etc..). Compass provides distributed index support but mainly through some grid solution (GigaSpaces, Oracle Coherence, Terrecota) many of which are commercial products, or by using the JDBC Directory which doesn't perform very well. Even when using Terracotta I don't know of an actual deployment which handles hundreds of million of documents (do you?) so it's hard to say how well it scales. Solr on the other hand already provides distributed/replication mechanism which is proven to work well on very large collections. But I do agree that if you don't need to handle such large scale deployments Compass may still fit your needs. If I would have to choose between Compass and Hibernate Search, I would definitely go for Compass (much more robust architecture... not bound to ORM... much more customizable..). More over, transaction support and very frequent updates (as in the case with most Compass deployments I've seen) are not always that scalable.... it very much depends on your collection (perhaps now with the near real-time searche support in Lucene it can be much better supported). > Solrj does have ability to write pojos and annotate them for mapping > to/from solr. This support is extremely limited compared to Compass. Compass can really be seen as an ORM-like framework on top of Lucene... supporting different types of relationships and aggregation in the domain model. This is actually one of the big differentiators between Compass and Solr... while in Solr the schema dictates the structure of the index, in Compass it's the domain model that defines the structure. =============================================================================== Please access the attached hyperlink for an important electronic communications disclaimer: http://www.credit-suisse.com/legal/en/disclaimer_email_ib.html ===============================================================================
