The "main" shard has some extra work to do. Namely 1> create the sub-requests 2> collate the results from all the sub-requests (including itself).
But this work is generally a small amount of the actual work being done, so it's often unnoticeable. That said, I'd just put all my slaves behind a load-balancer and let that mechanism send the requests to the various slaves if for no other reason than your LB should be able to detect if one of your machines goes down and send requests to slaves still running. I even know of one situation where the users "main" slave has _no_ index on it, it serves solely to distribute requests/aggregate results.... Best Erick On Sun, Jun 3, 2012 at 11:57 PM, ratabora <ratab...@gmail.com> wrote: > Hey Erick, > > It looks like the thread you mentioned talks about how to configure the > shards parameter in the Solr query. I am more interested in the 'main' shard > you query against when you make Solr queries (main shard being the shard you > direct the query against, > mainshard/select?q=*:*&shards=shard1,shard2,shard3) > > I think Suneel's original question is still unanswered, is it better to use > Scenario A or Scenario B? I suppose the 'main' shard is going to create a > sub query to the rest of the shards defined in the shard parameter, but I am > still wondering if you query the same main shard every time if that is going > to have a load/performance impact. > > > Suneel wrote >> >>> So scenario A (round-robin): >>> >>> query 1: /solr-shard-1/select?q=dog... shards=shard-1,shard2 >>> query 2: /solr-shard-2/select?q=dog... shards=shard-1,shard2 >>> query 3: /solr-shard-1/select?q=dog... shards=shard-1,shard2 >>> etc. >>> >>> or or scenario B (fixed): >>> >>> query 1: /solr-shard-1/select?q=dog... shards=shard-1,shard2 >>> query 2: /solr-shard-1/select?q=dog... shards=shard-1,shard2 >>> query 3: /solr-shard-1/select?q=dog... shards=shard-1,shard2 >> > > Thank you for any help. > > Regards, > Ryan Tabora > > > -- > View this message in context: > http://lucene.472066.n3.nabble.com/Round-Robin-concept-in-distributed-Solr-tp3636345p3987494.html > Sent from the Solr - User mailing list archive at Nabble.com.
