Hi, Recently we encountered a problem when solr cloud query latency suddenly increase, many simple queries that has small recall gets time out. After digging a bit I found that the root cause is some stats queries happen at the same time, such as
/solr/mycollection/select?stats=true&stats.field=unique_ids&stats.calcdistinct=true I see unique_ids is a high cardinality field so this query is quite expensive. But why a small volume of such query blocks other queries and make simple queries time out? I checked the solr thread pool and see there are plenty of idle threads available. We are using solr 7.6.2 with a 10 shard cloud set up. Is there a way to block certain solr queries based on url pattern? i.e. ignore the stats.calcdistinct request in this case. Thanks, Wei
