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https://issues.apache.org/jira/browse/SOLR-12181?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435773#comment-16435773
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David Smiley commented on SOLR-12181:
-------------------------------------

Cool [~ab].  I can imagine using this trigger for TRA (Time Routed Alias) to 
trigger new collections based on size.  I haven't looked at the details yet to 
see what's actually involved but it sounds exciting.  

> Add trigger based on document count
> -----------------------------------
>
>                 Key: SOLR-12181
>                 URL: https://issues.apache.org/jira/browse/SOLR-12181
>             Project: Solr
>          Issue Type: Sub-task
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: AutoScaling
>    Affects Versions: master (8.0)
>            Reporter: Andrzej Bialecki 
>            Assignee: Andrzej Bialecki 
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: SOLR-12181.patch
>
>
> This may turn out to be as simple as using a {{MetricTrigger}} but it's 
> likely this will require some specialization, and we may want to add this 
> type of trigger anyway for convenience.
> The two control actions associated with this trigger will be SPLITSHARD and 
> (yet nonexistent) MERGESHARD.



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