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https://issues.apache.org/jira/browse/SOLR-8251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14997547#comment-14997547
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Uwe Schindler commented on SOLR-8251:
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bq. This isn't as weird as it may seem when discussed abstractly ...
practically speaking it can be common for people to build up a
faceting/navigation system based on adding fqs to a "base query" as the user
drills down. If the user starts their navigation with a search then they have a
non-trivial "q" for their base query – but if the user didn't start with some
explicit search, they may just be drilling down from a starting view of "all
documents"
Hey Hoss, this was not meant as "stupid" - more its stüpid for Lucene to
execute like that. This is exactly th reason why I made it like that in 4.0
when I rewrote FilteredQuery... So basically the common case was very common.
> 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:
> {code}
> q={!cache=false}*:*&fq=+categoryIdsPath:1001&fl=id&start=0&rows=2&debug=true
> {code}
> 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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