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https://issues.apache.org/jira/browse/SOLR-16951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17762364#comment-17762364
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Alex Deparvu commented on SOLR-16951:
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have you checked on 9.3 as well? after SOLR-16720 the PKI parts were moved from 
onQueued to onBegin.

> HttpShardHandler performance degradation in Solr 9
> --------------------------------------------------
>
>                 Key: SOLR-16951
>                 URL: https://issues.apache.org/jira/browse/SOLR-16951
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>    Affects Versions: 9.0, 9.1, 9.2, 9.3
>            Reporter: Tomas Eduardo Fernandez Lobbe
>            Priority: Major
>
> After the work done in SOLR-14354, all shard requests are sent in the same 
> thread. {{send}} is supposed to be very fast so this shouldn't be a problem, 
> but we currently have {{PKIAuthenticationPlugin}} as a request 
> interceptor/listener, which is called for each shard request to generate and 
> add the authentication token. This part can take a couple milliseconds so 
> with enough shards, there is a noticeable slowdown in distributed search 
> requests.
> We should either speedup PKIAuthenticationPlugin interception (maybe caching? 
> reusing the same token for all shard requests?) and/or making the token 
> generation part run in parallel as it used to.



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