Tomas Eduardo Fernandez Lobbe created SOLR-16951:
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Summary: HttpShardHandler perf 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: 9.3
Reporter: Tomas Eduardo Fernandez Lobbe
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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