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https://issues.apache.org/jira/browse/SOLR-12357?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16598174#comment-16598174
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David Smiley commented on SOLR-12357:
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PR is looking great! I'll commit this tomorrow morning after some test runs.
> TRA: Pre-emptively create next collection
> ------------------------------------------
>
> Key: SOLR-12357
> URL: https://issues.apache.org/jira/browse/SOLR-12357
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: David Smiley
> Priority: Major
> Time Spent: 9h 20m
> Remaining Estimate: 0h
>
> When adding data to a Time Routed Alias (TRA), we sometimes need to create
> new collections. Today we only do this synchronously – on-demand when a
> document is coming in. But this can add delays as the documents inbound are
> held up for a collection to be created. And, there may be a problem like a
> lack of resources (e.g. ample SolrCloud nodes with space) that the policy
> framework defines. Such problems could be rectified sooner rather than later
> assume there is log alerting in place (definitely out of scope here).
> Pre-emptive TRA collection needs a time window configuration parameter,
> perhaps named something like "preemptiveCreateWindowMs". If a document's
> timestamp is within this time window _from the end time of the head/lead
> collection_ then the collection can be created pre-eptively. If no data is
> being sent to the TRA, no collections will be auto created, nor will it
> happen if older data is being added. It may be convenient to effectively
> limit this time setting to the _smaller_ of this value and the TRA interval
> window, which I think is a fine limitation.
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