For traditional, non-SolrCloud "distributed" mode, load balancing and
sharded queries are independent concepts - you can use them each separately
or together at your choice. If you want the query to be sharded for a
non-SolrCloud Solr server, then you need to pass the "shards" parameter on
each query. For SolrCloud the sharding of queries takes place automatically
without any shards parameter. But you should use the CloudSolrServer for
load balancing of SolrCloud anyway - internally it does the load balancing
automatically based on discovery of the SolrCloud configuration.
-- Jack Krupansky
-----Original Message-----
From: search engn dev
Sent: Friday, July 18, 2014 1:15 AM
To: solr-user@lucene.apache.org
Subject: Understanding query behaviour in LBHttpSolrServer
I just want to understand query flow and how load balancing works in case of
LBHttpSolrServer. We have setup SolrCloud with one collection, and that
collection has 4 shards and each shard has two nodes i.e one master and one
replica.
I have configured LBHttpSolrServer as below.
SolrServer lbHttpSolrServer = new
LBHttpSolrServer("http://shard1_master:8080/solr/","http://shard2_master:8080/solr/","http://shard3_master:8080/solr/","http://shard4_master:8080/solr/","http://shard1_replica:8080/solr/","http://shard2_replica:8080/solr/","http://shard3_replica:8080/solr/","http://shard4_replica:8080/solr/";,);
From my understanding solr and solrj works as below,
1. LBHttpSolrServer keeps pinging above list of servers and maintains list
of live servers.
2. Every time query arives it picks one server from the list (round-robin
fashion)
3. Sends query to selected server server.
4. When query arives at solr node it internally distributes query to
remaining shards , collects,merges,ranks results and sends response back to
the user.
Here my confusion is at point number 4, is my understanding correct? if not
please correct. And do i need to pass all 8 nodes to LBHttpSolrServer or
just 4 will be sufficient .
--
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