On 11/6/2015 1:01 PM, wei wrote: > Thanks Jack and Shawn. I checked these Jira tickets, but I am not sure if > the slowness of MatchAllDocsQuery is also caused by the removal of > fieldcache. Can someone please explain a little bit?
I only glanced at your full output in the message at the start of this thread. I thought I saw facet output in it, but it turns out that the only mention of facets was the timing information from the debug, so that very likely rules out the FieldCache change as a culprit. I am suspecting that the 4.7 index is warmed better, and may have the specific filter query (categoryIdsPath:1001)already sitting in the filterCache. Try running that query a few of times on both versions, then restart Solr on both versions so they both start clean, and run the query *once* on each system, and see whether there's still a large discrepancy. If one of the systems is receiving queries from active clients and the other is not, then the comparison will be unfair, and biased towards the one that is getting additional queries. Query activity, even if it seems unrelated to the query you are testing, has a tendency to reduce overall qtime values. Thanks, Shawn
