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https://issues.apache.org/jira/browse/SOLR-9554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15519494#comment-15519494
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Alan Woodward commented on SOLR-9554:
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See https://jenkins.thetaphi.de/job/Lucene-Solr-master-Solaris/862/consoleFull
for an example. The '.system' collection isn't created properly, because one
of the replicas crashes on startup due to this race.
I guess the straightforward fix is to detect if 'schema.xml' isn't there any
more, and retry reading 'managed-schema' instead.
> 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
>
> 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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