You don't know what documents to bring up summaries for before you have merged and sorted the docIds from all shards. And you don't want to waste resources by fetching it all. Example: Phase 1 request: q=foo bar&rows=10&sort=price asc&shards=node1:8983,node2:8983,node3:8983 Phase 1 response: The doc-ids of the 10 lowest prices products from each of the three shards (total 30) Phase 2 request: Request the summaries based on IDs. This may be 3+3+4, 10+0+0, 1+1+8 or any other distribution Phase 2 response: The actual summaries from each shard
-- Jan Høydahl, search solution architect Cominvent AS - www.cominvent.com On 13. okt. 2010, at 19.04, Dennis Gearon wrote: > I think that's good thinking. I wonder, do the two phases have to be invoked > externally by two queries, or why couldn't it be all self contained in each > instance behind the load leveler? > > Just curious how it works. > > Dennis Gearon > > Signature Warning > ---------------- > It is always a good idea to learn from your own mistakes. It is usually a > better idea to learn from others’ mistakes, so you do not have to make them > yourself. from > 'http://blogs.techrepublic.com.com/security/?p=4501&tag=nl.e036' > > EARTH has a Right To Life, > otherwise we all die. > > > --- On Wed, 10/13/10, Yonik Seeley <yo...@lucidimagination.com> wrote: > >> From: Yonik Seeley <yo...@lucidimagination.com> >> Subject: Re: LuceneRevolution - NoSQL: A comparison >> To: solr-user@lucene.apache.org >> Date: Wednesday, October 13, 2010, 5:46 AM >> On Tue, Oct 12, 2010 at 12:11 PM, Jan >> Høydahl / Cominvent >> <jan....@cominvent.com> >> wrote: >>> I'm pretty sure the 2nd phase to fetch doc-summaries >> goes directly to same server as first phase. But what if you >> stick a LB in between? >> >> A related point - the load balancing implementation that's >> part of >> SolrCloud (and looks like it will be committed to trunk >> soon), does >> keep track of what server it used for the first phase and >> uses that >> for subsequent phases. >> >> -Yonik >> http://www.lucidimagination.com >>
