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https://issues.apache.org/jira/browse/SOLR-9554?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mikhail Khludnev updated SOLR-9554:
-----------------------------------
    Attachment: SOLR-9554.patch

when I tried to catch this race with debugger, I found that mock responds false 
by default, that bypasses condition in 
{{ManagedIndexSchemaFactory.zkUgradeToManagedSchema()}}
{code}
  if (zkController.pathExists(nonManagedSchemaPath)) {
{code}
here I modified mock. but it still can't catch this race.. 


> Multiple ManagedIndexSchemaFactory upgrades running simultaneously can clash, 
> causing cores not to load
> -------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-9554
>                 URL: https://issues.apache.org/jira/browse/SOLR-9554
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Alan Woodward
>         Attachments: SOLR-9554.patch, SOLR-9554.patch
>
>
> If a collection is created using a configset with a ManagedSchemaFactory but 
> no managed-schema file, then multiple cores may try and convert the schema 
> file simultaneously.



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