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https://issues.apache.org/jira/browse/SOLR-13420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gus Heck resolved SOLR-13420.
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Resolution: Fixed
Fix Version/s: 8.2
master (9.0)
> Allow Routed Aliases to use Collection Properties instead of core properties
> ----------------------------------------------------------------------------
>
> Key: SOLR-13420
> URL: https://issues.apache.org/jira/browse/SOLR-13420
> Project: Solr
> Issue Type: Sub-task
> Components: SolrCloud
> Affects Versions: master (9.0)
> Reporter: Gus Heck
> Assignee: Gus Heck
> Priority: Major
> Fix For: master (9.0), 8.2
>
> Attachments: SOLR-13420.patch, SOLR-13420.patch, SOLR-13420.patch,
> SOLR-13420.patch, SOLR-13420.patch
>
>
> The current routed alias code is relying on a core property named
> routedAliasName to detect when the Routed Alias wrapper URP should be applied
> to Distributed Update Request Processor.
> {code:java}
> #Written by CorePropertiesLocator
> #Sun Mar 03 06:21:14 UTC 2019
> routedAliasName=testalias21
> numShards=2
> collection.configName=_default
> ... etc...
> {code}
> Core properties are not changeable after the core is created, and they are
> written to the file system for every core. To support a unit test for
> SOLR-13419 I need to create some legacy formatted collection names, and
> arrange them into a TRA, but this is impossible due to the fact that I can't
> change the core property from the test. There's a TODO dating back to the
> original TRA implementation in the routed alias code to switch to collection
> properties instead, so this ticket will address that TODO to support the test
> required for SOLR-13419.
> Back compatibility with legacy core based TRA's and CRA's will of course be
> maintained. I also expect that this will facilitate some more nimble handling
> or routed aliases with future auto-scaling capabilities such as possibly
> detaching and archiving collections to cheaper, slower machines rather than
> deleting them. (presently such a collection would still attempt to use the
> routed alias if it received an update even if it were no longer in the list
> of collections for the alias)
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