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From jaime spicciati <>
Subject Question about session affinity and SolrCloud
Date Sat, 14 Feb 2015 20:39:59 GMT
This is my current understanding of how SolrCloud load balancing works...

Within SolrCloud, for a cluster with more than 1 shard and at least 1
replica, the Zookeeper aware SolrJ client uses LBHTTPSolrServer which is
round robin across the replicas and leaders in the cluster. In turn the
shard (which can be a leader or replica) that performs the distributed
query may then go to the leader or replica for each shard based on round
robin via LBHTTPSolrServer.

If this is correct then in a SolrCloud instance that has let's say 1
replica, the initial query from the user may go to the leader for shard 1,
then when the user paginates to the second page the subsequent query may go
to the replica of shard 1. This seems inefficient from a caching
perspective where the queryResultCache and possibly the filterCache would
need to be reloaded.

>From what I can find there does not appear to be any option of session
affinity within the SolrCloud query execution?


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