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https://issues.apache.org/jira/browse/SOLR-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16476575#comment-16476575
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Tomás Fernández Löbbe commented on SOLR-12356:
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Even if this is the default, can there be an opt out? (i.e. a solr.xml config
option)? I imagine people upgrading from older versions of Solr that have built
their own metrics/scaling may not want this collection around. Features
requiring .system collection then should have graceful failures in case of the
collection not being there.
> Always auto-create ".system" collection when in SolrCloud mode
> --------------------------------------------------------------
>
> Key: SOLR-12356
> URL: https://issues.apache.org/jira/browse/SOLR-12356
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: Andrzej Bialecki
> Priority: Major
>
> The {{.system}} collection is currently used for blobs, and in SolrCloud mode
> it's also used for autoscaling history and as a metrics history store
> (SOLR-11779). It should be automatically created on Overseer start if it's
> missing.
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