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https://issues.apache.org/jira/browse/SOLR-16720?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709684#comment-17709684
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Jason Gerlowski commented on SOLR-16720:
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Ah, my mistake - I went to fucit and the massive 57% failure rate testcase drew 
my eye; I missed that testMetrics had started failing as well.

Will revert now so this doesn't cause noise for folks while I debug.

> PKI should decorate outgoing requests at "sending", not "enqueueing" time
> -------------------------------------------------------------------------
>
>                 Key: SOLR-16720
>                 URL: https://issues.apache.org/jira/browse/SOLR-16720
>             Project: Solr
>          Issue Type: Improvement
>          Components: Authentication
>    Affects Versions: 9.2
>            Reporter: Jason Gerlowski
>            Priority: Minor
>         Attachments: SOLR-16720-reproduce.patch, Screen Shot 2023-04-07 at 
> 9.16.30 AM.png, reproduce.sh
>
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> Currently, PKIAuthenticationPlugin decorates intra-node requests using an 
> 'onQueue' lifecycle hook, which is triggered when the request is enqueued for 
> processing by the (asynchronous) Jetty http client.
> This works great on many systems.  However on heavily loaded clusters the 
> time between Jetty "queueing" the request and it actually being sent out can 
> be non-negligible.  If this gap becomes wide enough, the TTL encoded into the 
> PKI auth header might have substantially or fully expired by the time the 
> receiving node gets the request.
> We should experiment with moving PKI header decoration to the 'onBegin' hook 
> instead, which fires much closer to the actual request-send time on heavily 
> loaded servers.



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