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https://issues.apache.org/jira/browse/SOLR-14394?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17077591#comment-17077591
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David Smiley commented on SOLR-14394:
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When I investigated this last week and ran tests, I found a bug wherein the V2
API does not "see" these lazy request handlers because they are not registered.
I locally hacked {{org.apache.solr.core.PluginBag#put(java.lang.String,
org.apache.solr.core.PluginBag.PluginHolder<T>)}} to make it work but it's just
an experimental nocommit. The real problem is that
{{org.apache.solr.api.ApiSupport#registerV2}} exists when in this day & age,
simply everything should register as V2. So that's a bit of dependent
tech-debt.
> Many request handlers should be startup=lazy
> --------------------------------------------
>
> Key: SOLR-14394
> URL: https://issues.apache.org/jira/browse/SOLR-14394
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: David Smiley
> Priority: Minor
>
> Solr cores track a lot of granular metric information per request handler.
> This is noise for a request handler that we aren't even using! The vast
> majority of request handlers are not used in a typical app. That doesn't
> mean they shouldn't be available for use, I'm only saying that they aren't
> until perhaps for diagnostic purposes or something. *I think it would be
> better to not track metrics on something until we actually use it.* For a
> request handler, this is done by setting startup=lazy. Most implicitly
> registered plugins should have this set in ImplicitPlugins.json.
> CC [~ab] [~noble.paul]
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