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https://issues.apache.org/jira/browse/SOLR-8251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15185839#comment-15185839
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wei shen commented on SOLR-8251:
--------------------------------
I installed 5.5. I found that pure blank query it is much faster, however
combined with filter query it is slower. It might be a different issue.
for query: q={!cache=false}*:*&fl=id&start=0&rows=2
solr 5.5(50ms) is much faster than solr4.7(400ms)
however, after add a fq clause
q={!cache=false}*:*&fq=+categoryIdsPath:1001&fl=id&start=0&rows=2
solr5.5 (130ms) is still slower than solr4.7 (70ms)
what's more, with the query with filter is slower compare to query without
filter in 5.5.
one more experiment is that i disable the filtercache by adding
"{!cache=false}"
rows=2&fl=id&q={!cache=false}*:*&fq={!cache=false}categoryIdsPath:1001
solr5.5 (20-25ms) slightly faster than solr4.7(around 25-30ms), both are much
faster comparing to using filter cache.
Any reason about that?
Shall I open a separate ticket on it?
> 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, 5.3.1
> Reporter: wei shen
> Assignee: Yonik Seeley
> Fix For: 5.5, master
>
> Attachments: Solr 4 vs Solr 5.png
>
>
> 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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