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https://issues.apache.org/jira/browse/SOLR-16951?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17959550#comment-17959550
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ASF subversion and git services commented on SOLR-16951:
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Commit 816b150c617e97f87d8345c57db0821709815f90 in solr's branch
refs/heads/branch_9x from Houston Putman
[ https://gitbox.apache.org/repos/asf?p=solr.git;h=816b150c617 ]
SOLR-16951: Fixes for PKIAuthenticationPlugin commit
> HttpShardHandler performance degradation in Solr 9
> --------------------------------------------------
>
> Key: SOLR-16951
> URL: https://issues.apache.org/jira/browse/SOLR-16951
> Project: Solr
> Issue Type: Bug
> Affects Versions: 9.0, 9.1, 9.2, 9.3
> Reporter: Tomas Eduardo Fernandez Lobbe
> Priority: Major
> Labels: pull-request-available
> Time Spent: 2h 10m
> Remaining Estimate: 0h
>
> 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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