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https://issues.apache.org/jira/browse/SOLR-11900?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16341937#comment-16341937
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David Smiley commented on SOLR-11900:
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Perhaps in fact we don't actually need a new API but instead have a delete
query that looks like this {{timeRoutedField:[* TO NOW/MONTH]}} auto-purge the
old collections. We've already got the URP in place to intercept and act.
Arguably if new data creates collections, telling it to delete old stuff should
delete the old collections.
Regardless of how this feature looks, there will be a separate issue to
auto-delete. The issue here is about being explicit about it.
> API command to delete oldest collections in a time routed alias
> ---------------------------------------------------------------
>
> Key: SOLR-11900
> URL: https://issues.apache.org/jira/browse/SOLR-11900
> Project: Solr
> Issue Type: Sub-task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: SolrCloud
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Fix For: 7.3
>
>
> For Time Routed Aliases, we'll need an API command to delete the oldest
> collection(s). Perhaps the command action name is
> DELETE_COLLECTION_OF_ROUTED_ALIAS (yes that's long). And input is of course
> the routed alias name, plus a mandatory "before" which is a standard time
> input that Solr accepts that will likely include date math. Thus if you used
> before="NOW/DAY-90DAYS" then your guaranteed to have the last 90 days worth
> of data. If a collection overlaps past what "before" is computed to be then
> it needs to stay. The pattern might match any number of collections, perhaps
> none. But in all cases, the most recent collection must be retained -- the
> time routed aliases must at all times refer to at least one collection.
> The underlying steps will be to first update the alias, and then delete the
> collection(s). It ought to return the collections that get deleted.
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