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https://issues.apache.org/jira/browse/SOLR-13739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929349#comment-16929349
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ASF subversion and git services commented on SOLR-13739:
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Commit f56aacd0a1f4c75936ab6cec779066546a9439f9 in lucene-solr's branch
refs/heads/branch_8x from Thomas Wöckinger
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=f56aacd ]
SOLR-13739: Optimized large managed schema modifications
Internal O(n^2) problem.
Fixes #855
(cherry picked from commit e788024b84b1402295d4fe6e0c8b818ae3772a52)
> 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, master (9.0), 8.2, 8.1.1
> Reporter: Thomas Wöckinger
> Priority: Major
> Labels: easyfix, performance, pull-request-available,
> ready-to-commit
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> 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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