Hello, I am seeing very slow response from json faceting against a single core (though core is shard leader in a collection).
Fields processId and resultId are non-multivalued, indexed and docvalues string (not text). Soft Commit = 5sec (opensearcher=true) and Hard Commit = 10sec because new docs are constantly being indexed with 95% new and 5% overwritten (overwrite=true; no atomic update). Caches are not considered useful due to commit frequency. Solr is v8.7.0 on openjdk11. Is there any way to improve json facet QTime? ## query only curl 'http://localhost:8983/solr/TestCollection_shard1_replica_t3/query?q=processId:xxxx-xxx-xxx-xxx-xxxxx&rows=0' -d ' { "responseHeader":{ "zkConnected":true, "status":0, "QTime":552, "params":{ "q":"processId:xxxx-xxx-xxx-xxx-xxxxx", "cache":"false", "rows":"0"}}, "response":{"numFound":231311,"start":0,"numFoundExact":true,"docs":[] }} ## json facet takes 46secs curl 'http://localhost:8983/solr/TestCollection_shard1_replica_t3/query?q=processId:xxxx-xxx-xxx-xxx-xxxxx&rows=0' -d ' json.facet={ categories:{ "type": "terms", "field" : "resultId", "limit" : 1 } }' { "responseHeader":{ "zkConnected":true, "status":0, "QTime":46972, "params":{ "q":"processId:xxxx-xxx-xxx-xxx-xxxxx", "json.facet":"{ categories:{ \"type\": \"terms\", \"field\" : \"resultId\", \"limit\" : 1 }}", "rows":"0"}}, "response":{"numFound":231311,"start":0,"numFoundExact":true,"docs":[] }, "facets":{ "count":231311, "categories":{ "buckets":[{ "val":"xxxxxxxxx", "count":943}]}}} ## visualvm CPU sampling almost all time spent in lucene: org.apache.lucene.util.PriorityQueue.downHeap() 23,009 ms org.apache.lucene.codecs.lucene80.Lucene80DocValuesProducer$TermsDict.next() 13,268 ms -- Sent from: https://lucene.472066.n3.nabble.com/Solr-User-f472068.html
