Hi, I have a question about how to complete separate queries and updates in a cluster of mixed TLOG and PULL replicas.
solr cloud setup: Solr-7.6.0, 10 shards, each shard has 2 TLOG + 4 PULL replicas. In solrconfig.xml we set preferred replica type for queries to PULL: <initParams path="/select"> <lst name="defaults"> <str name= "shards.preference">replica.type:PULL</str> </lst> </initParams> A load-balancer is set up in front of the solr cloud, including both TLOG and PULL replicas. Also we use a http client for queries. Some observations: 1. In the TLOG replicas, I see about the same number of external queries in jetty access log. It is expected as our load balancer does not differentiate TLOG and PULL replicas. My question is, when the TLOG replica receives an external query, will it forward to one of the PULL replicas? Or will it send the shard request to PULL replicas but still serve as the aggregate node for the query? 2. In the TLOG replicas, I am still seeing some internal shard request, but in much lower volume compare to PULL replicas. I checked one leader TLOG replica, the number of shard requests is 1% of that on PULL replicas in the same shard. With shards.preference=replica.type:PULL, why would the TLOG receive any internal shard request? To completely separate query and updates, I think that I might need to have the load-balancer set up to include only the PULL replicas. Is there any other option? Thanks, Wei
