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https://issues.apache.org/jira/browse/SOLR-16860?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul resolved SOLR-16860.
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Fix Version/s: 9.3
Resolution: Fixed
> Coordinator ZkStateReader's watch is not removed upon collection deletion
> -------------------------------------------------------------------------
>
> Key: SOLR-16860
> URL: https://issues.apache.org/jira/browse/SOLR-16860
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Affects Versions: 9.2.1
> Reporter: Patson Luk
> Assignee: Noble Paul
> Priority: Major
> Fix For: 9.3
>
> Time Spent: 50m
> Remaining Estimate: 0h
>
> Core registration in CoordinatorHttpCall correctly registers watch in
> ZkStateReader as in
> https://github.com/apache/solr/blob/f774922ecf44b18b78435cef8735618bb793ac30/solr/core/src/java/org/apache/solr/servlet/CoordinatorHttpSolrCall.java#L99,
> however there’s no code to remove such watch on collection deletion (state
> update).
> For non coordinator node, it’s done at UnloadCoreOnDeleteWatcher at
> https://github.com/apache/solr/blob/main/solr/core/src/java/org/apache/solr/cloud/ZkController.java#L2869
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