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From "Gus Heck (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (SOLR-13420) Allow Routed Aliases to use Collection Properties instead of core properties
Date Fri, 14 Jun 2019 21:35:00 GMT

     [ https://issues.apache.org/jira/browse/SOLR-13420?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gus Heck updated SOLR-13420:
----------------------------
    Fix Version/s:     (was: 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: 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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