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https://issues.apache.org/jira/browse/SOLR-9818?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15885278#comment-15885278
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Ere Maijala commented on SOLR-9818:
-----------------------------------
I initially encountered this issue when trying to reload a collection, so
fixing ADDREPLICA of course only fixes one instance where this might happen.
In my case I would have been happy with an error message that says that the
connection timed out and that there's no guarantee that the request was
processed or whether it's still being processed. It would be ok to poll the
server automatically to see if it's available again, but only like at max once
a second or so and with a safe request.
> Solr admin UI rapidly retries any request(s) if it loses connection with the
> server
> -----------------------------------------------------------------------------------
>
> Key: SOLR-9818
> URL: https://issues.apache.org/jira/browse/SOLR-9818
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Admin UI
> Affects Versions: 6.3
> Reporter: Ere Maijala
>
> It seems that whenever the Solr admin UI loses connection with the server, be
> the reason that the server is too slow to answer or that it's gone away
> completely, it starts hammering the server with the previous request until it
> gets a success response, it seems. That can be especially bad if the last
> attempted action was something like collection reload with a SolrCloud
> instance. The admin UI will quickly add hundreds of reload commands to
> overseer/collection-queue-work, which may essentially cause the replicas to
> get overloaded when they're trying to handle all the reload commands.
> I believe the UI should never retry the previous command blindly when the
> connection is lost, but instead just ping the server until it responds again.
> Steps to reproduce:
> 1.) Fire up Solr
> 2.) Open the admin UI in browser
> 3.) Open a web console in the browser to see the requests it sends
> 4.) Stop solr
> 5.) Try an action in the admin UI
> 6.) Observe the web console in browser quickly fill up with repeats of the
> originally attempted request
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