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From Thomas Wöckinger (Jira) <>
Subject [jira] [Created] (SOLR-13739) Managed resource observers have to be added only once
Date Wed, 04 Sep 2019 08:50:00 GMT
Thomas Wöckinger created SOLR-13739:

             Summary: Managed resource observers have to be added only once
                 Key: SOLR-13739
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: Server
    Affects Versions: 8.1.1, 8.2, 8.1, 8.0
            Reporter: Thomas Wöckinger

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

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

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