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https://issues.apache.org/jira/browse/SOLR-17334?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Noble Paul reassigned SOLR-17334:
---------------------------------

    Assignee: Noble Paul

> Minor bugs in Solr dedicated coordinator mode
> ---------------------------------------------
>
>                 Key: SOLR-17334
>                 URL: https://issues.apache.org/jira/browse/SOLR-17334
>             Project: Solr
>          Issue Type: Improvement
>      Security Level: Public(Default Security Level. Issues are Public) 
>          Components: SolrCloud
>    Affects Versions: 9.6
>            Reporter: Torsten Bøgh Köster
>            Assignee: Noble Paul
>            Priority: Major
>
> We recently put dedicated Solr coordinator nodes into production and stumbled 
> upon some minor bugs/improvements:
>  - The Solr root resource cannot be requested on a coordinator node
>  - Coordinator requests are enabled for the {{/select}} handler only
>  - From outside proxied and coordinator requests cannot be distinguished
> h3. Solr root resource
> We adopted a general fix from the {{HttpSolrCall}} to check whether the given 
> {{collectionName}} is {{{}null{}}}. This fixes requesting the root resource 
> (and maybe other similar requests)
> h3. {{/select}} handler only
> Coordinator requests are limited to the {{/select}} handler. In our 
> environment we make heavy usage of pre-configured Solr handlers. We could not 
> find any reason to limit coordinator calls to the {{/select}} handler and 
> removed the limitation.
> h3. Coordinator requests cannot be identified by Solr response
> With any Solr response you cannot distinguish coordinator from proxied (or 
> regular) requests. While this is great for consistency it makes testing extra 
> hard. We added an extra Solr header field with the coordinator node name 
> called {{requestCoordinatorNode}} when debug is enabled. This eases testing 
> and debugging a lot.
>  
> A Pull Request is in the making!



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