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https://issues.apache.org/jira/browse/SOLR-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16516817#comment-16516817
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Andrzej Bialecki commented on SOLR-12356:
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In other words, these are the main concerns and the answers:
* when do we create the collection?
** it's too late to do this on first use because first updates will always fail
** CollectionsHandler can automatically create this collection when the first
collection is created.
** users can opt out of having this collection (by setting a property using
cluster properties API), and components should handle the absence of this
collection gracefully. In any case the cost of this collection should be
negligible.
* how many replicas to create and what will be their placement?
** use a configurable default RF eg. 3, unless there are fewer nodes in the
cluster (then the limit is the number of nodes)
** use {{AutoAddReplicasPlanAction}} to automatically increase the number of
replicas to the desired RF as more nodes are added
** use autoscaling preferences to automatically place replicas on different
physical nodes
* how to control the size of the collection as new documents are being added?
** we could use the {{.scheduled_maintenance}} trigger with an action that
periodically prunes the collection based either on index size or time-to-live
criteria.
> 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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