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https://issues.apache.org/jira/browse/SOLR-6892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14259449#comment-14259449
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Alexandre Rafalovitch commented on SOLR-6892:
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q. The default urp chain must be immutable

Careful with that one. There are sometimes valid reasons with putting an URP 
*after* DistributedUpdateProcessor. I believe it is usually connected with 
accessing stored content during the atomic update. We don't want to completely 
loose that flexibility.

Also, Debugging URP may want to be the last items in the chain too.

> Make update processors toplevel components 
> -------------------------------------------
>
>                 Key: SOLR-6892
>                 URL: https://issues.apache.org/jira/browse/SOLR-6892
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Noble Paul
>            Assignee: Noble Paul
>
> The current update processor chain is rather cumbersome and we should be able 
> to use the updateprocessors without a chain.
> The scope of this ticket is 
> * <updateProcessor> tag becomes a toplevel tag and it will be equivalent to 
> the <processor> tag inside <updateRequestProcessorChain> . The only 
> difference is that it should require a {{name}} attribute
> * Any update request will be able  to pass a param {{processor=a,b,c}} , 
> where a,b,c are names of update processors. A just in time chain will be 
> created with those update processors
> * Some in built update processors (wherever possible) will be predefined with 
> standard names and can be directly used in requests 



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