On 3/20/2018 11:18 PM, Midas A wrote:
I have one question here a) solr cloud load balance requests internally (Round robin or anything else ).
Yes, SolrCloud does load balance requests across active replicas in the entire cloud. I do not know what algorithm it uses for load balancing -- whether that's round-robin or something else.
b) How can i change this behaviour (Note. I have solr cloud with mix of machines physical and virtual )
There is some effort underway to allow SolrCloud to prefer specific replica types. Recent versions of Solr added TLOG and PULL types, to supplement the NRT type that all versions of SolrCloud have. There is strong interest in being able to prefer one of the new types and let the NRT replicas handle indexing only when possible.
There is already a "preferLocalShards" parameter ... but enabling this parameter can actually make performance *worse*, by concentrating requests onto a single machine and leaving the other machines in the cloud idle.
Thanks, Shawn
