[jira] [Created] (SOLR-8251) MatchAllDocsQuery is much slower in solr5.3.1 compare to solr4.7

["wei shen (JIRA)" <ji...@apache.org>]

wei shen created SOLR-8251:
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             Summary: MatchAllDocsQuery is much slower in solr5.3.1 compare to solr4.7
                 Key: SOLR-8251
                 URL: https://issues.apache.org/jira/browse/SOLR-8251
             Project: Solr
          Issue Type: Bug
          Components: search
    Affects Versions: 5.3
            Reporter: wei shen


I am trying to upgrade our production solr instance from 4.7 to 5.3.1. Unfortunately when I do load testing I find the MatchAllDocsQuery is much slower in solr 5.3.1 compare to 4.7. (solr 5.3.1 is faster in load test with queries other than MatchAllDocsQuery). I asked solr-user and discussed with Yonik Seeley. He confirmed that he can see the problem too comparing solr 5.3.1 and 4.10.

here is the query I use:
q={!cache=false}*:*&fq=+categoryIdsPath:1001&fl=id&start=0&rows=2&debug=true

for me the query is consistently about 60-70% slower on solr5 than solr4.

Yonik mentioned in his email "For me, 5.3.1
is about 5x slower than 4.10 for this particular query."



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