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https://issues.apache.org/jira/browse/SOLR-16350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17585107#comment-17585107
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Shubanker commented on SOLR-16350:
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I faced this issue in an environment where SOLR was deployed and the internet
is restricted behind a proxy, to replicate this I used this tool to delay DNS
resolution and lose packets in local, and SOLR 9 response became slow while I
am not able to find any evidence yet that SOLR is attempting to make an
internet request, the behavior seems so (it works fine if the internet is
completely off i.e instant failure or the connection is stable).
I have replicated this in my local, I have tested SOLR 8 & 7 in the same
environments (both local and deployment) and they work just fine, I am only
facing this issue with SOLR 9.
Here are the steps I have used to replicate this issue.
* use the tool to delay DNS resolution and packet loss.
* start SOLR
* make a request to SOLR and it's delayed.
Sometimes while using this restricting tool for a while, OS detects no internet
availability and then the internet request starts failing instantly in that
situation also SOLR starts responding instantly.
> http response is delayed when solr is running in slow/restricted network
> environment
> ------------------------------------------------------------------------------------
>
> Key: SOLR-16350
> URL: https://issues.apache.org/jira/browse/SOLR-16350
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Admin UI
> Affects Versions: 9.0
> Environment: !image-2022-08-23-09-56-45-250.png|width=327,height=170!
> restrict/delay internet and DNS resolution time.
> Reporter: Shubanker
> Priority: Major
> Attachments: image-2022-08-23-09-56-45-250.png,
> image-2022-08-23-09-59-25-775.png, image-2022-08-23-10-01-40-456.png,
> image-2022-08-23-10-03-45-870.png
>
>
> While trying to setup SOLR 9 I noticed the response takes longer to complete
> if the internet is slow/restricted.
> I tried replicating in local by delaying DNS response and the request started
> taking over 4s while the query itself (QTime) is faster.
> !image-2022-08-23-10-03-45-870.png|width=429,height=150!
> !image-2022-08-23-09-59-25-775.png|width=301,height=188!
> even the static files of Admin UI take too long to load.
> related StackOverflow
> [question|https://stackoverflow.com/questions/73444575/solr-9-http-response-time-is-very-slow-while-query-itself-is-fast].
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