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https://issues.apache.org/jira/browse/SOLR-12356?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16516999#comment-16516999
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Noble Paul commented on SOLR-12356:
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bq.use a configurable default RF eg. 3, unless there are fewer nodes in the
cluster (then the limit is the number of nodes)
The default RF should be very high. By default, for a small cluster , there
should be a replica of {{.system}} collection in every node. For a user of a
small cluster , it's too much of a learning curve if his {{.system}} collection
is not available
bq.use AutoAddReplicasPlanAction to automatically increase the number of
replicas to the desired RF as more nodes are added
I don't think a user should know anything about the autoscaling thing to use
{{.system}} collection. We should define the default behavior and it should all
happen behind the scenes. If replicas are to be created, they should be created
automatically.
bq.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.
We should have a sensible default for the maximum index size of the {{.system}}
collection. Something like 100mb sounds OK. Once it crosses this threshold, the
system should automaticlly do the pruning.The user should not be exposed to the
autoscaling framework at all for this pruning to happen
When I say we should not expose the user to the autoscaling framework, it's
desirable to not even have an entry in the {{autoscaling.json}}. These can be
implicit triggers which are automatically registered/unregistered based on
presence/absence of certain cluster properties
> 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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