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https://issues.apache.org/jira/browse/SOLR-12616?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16571751#comment-16571751
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Amrit Sarkar commented on SOLR-12616:
-------------------------------------
Thanks Varun for such detailed analysis and feedback on the issue. I see
SOLR-11598 resulted in slowness. Benchmarks done at my end also validates an
approx 10-18% slowdowns in overall processing of export results.
I digged deeper and found the actual function which is slow, but have no idea
of reason. Let me share the analysis first:
For query Q1, single sort, with {{SingleValueSortDoc}} introduced again, taking
4 mins, while vanila master branch code taking 4:45 mins. I attache a sampler
and attaching screenshots for the respective export query executions.
If you see screenshots: {{SingleSortValue-2}} and {{DefaultSortValue-2}}, the
only significant difference (around 33 secs) between the processing times of
respective executions is {{setCurrentValue(docId)}}, which we haven't touched.
SingleSortValue: setCurrentValue(docId): *148 secs*
DefaultCode: setCurrentValue(docId): *181 secs*
I have analyzed the code properly enough to conclude we are not making extra /
unnecessary calls for {{setCurrentValue}}, we know the exact line number which
is causing the slowness: *ExportWriter:235*
> Track down performance slowdowns with ExportWriter
> --------------------------------------------------
>
> Key: SOLR-12616
> URL: https://issues.apache.org/jira/browse/SOLR-12616
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Varun Thacker
> Priority: Major
> Attachments: DefaultCode-1.png, DefaultCode-2.png, SOLR-12616.patch,
> SingleSortValue-1.png, SingleSortValue-2.png
>
>
> Just to be clear for users glancing through this Jira : The performance
> slowdown is currently on an unreleased version of Solr so no versions are
> affected by this.
> While doing some benchmarking for SOLR-12572 , I compared the export writers
> performance against Solr 7.4 and there seems to be some slowdowns that have
> been introduced. Most likely this is because of SOLR-11598
> In an 1 shard 1 replica collection with 25M docs. We issue the following
> query
> {code:java}
> /export?q=*:*&sort=id desc&fl=id{code}
> Solr 7.4 took 8:10 , 8:20 and 8:22 in the 3 runs that I did
> Master took 10:46
> Amrit's done some more benchmarking so he can fill in with some more numbers
> here.
>
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