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https://issues.apache.org/jira/browse/SOLR-13739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16922296#comment-16922296
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Thomas Wöckinger commented on SOLR-13739:
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The improvement on our side results in a creation time of ~30 seconds instead
of 30 minutes
> Managed resource observers have to be added only once
> -----------------------------------------------------
>
> Key: SOLR-13739
> URL: https://issues.apache.org/jira/browse/SOLR-13739
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: Server
> Affects Versions: 8.0, 8.1, 8.2, 8.1.1
> Reporter: Thomas Wöckinger
> Priority: Major
> Labels: easyfix, performance
>
> On huge schema modifications, mostly happen due to creation of a new
> collection, the same observer instance of an ResourceLoaderAware component is
> added again and again.
> This leads to a runtime behaviour of n²/2 where n is is the number of schema
> operation multiplied by ResourceLoaderAware components instead of the number
> of containing ResourceLoaderAware components.
> E.g. If you have 1000 schema operations and 2 ResourceLoaderAware components
> this leads to 500000 operations instead of 2000.
> Even worse the corresponding resource is registered again and again, which
> can take some time e.g. ManagedSynonymGraphFilterFactory needs about 5s on
> each call (depending on the size of synonyms).
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