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https://issues.apache.org/jira/browse/SOLR-16542?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17780103#comment-17780103
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David Smiley commented on SOLR-16542:
-------------------------------------

The point is to make incremental progress, particularly on an aspect that I 
don't think is controversial.  Okay?

You make a good point about doing this change in a backwards-compatible way.  I 
think the client/user perceived result of the scenario you describe is a 
failure or timeout; the upload won't happen.  Then they will eventually retry 
and succeed.  I think it's not worth the backwards-compatibility 
effort/complexity to have configSet operations be error-free during an in-place 
upgrade.  There was recent agreement about this for collection restores that 
might happen during an upgrade.

> Remove OverseerConfigSetMessageHandler; always do distributed mode
> ------------------------------------------------------------------
>
>                 Key: SOLR-16542
>                 URL: https://issues.apache.org/jira/browse/SOLR-16542
>             Project: Solr
>          Issue Type: Sub-task
>          Components: SolrCloud
>            Reporter: David Smiley
>            Priority: Major
>              Labels: newdev
>             Fix For: main (10.0)
>
>         Attachments: output5.log, output6.log
>
>          Time Spent: 1h 40m
>  Remaining Estimate: 0h
>
> {{distributedCollectionConfigSetExecution}} is a boolean setting on 
> solr.xml/solrCloud that switches *both* Collection API *and* ConfigSet API 
> processing between Overseer based (when =false) vs distributed (when =true).  
> In this issue, remove the Overseer based processing of ConfigSets, thus 
> always use DistributedCollectionConfigSetCommandRunner instead for ConfigSet 
> processing, regardless of the {{distributedCollectionConfigSetExecution}} 
> boolean setting.  Namely, OverseerConfigSetMessageHandler would be removed.  
> The boolean toggle would henceforth only toggle the "collection" aspect of 
> wether to do distributed processing vs Overseer (centralized).



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