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https://issues.apache.org/jira/browse/SOLR-6892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14265059#comment-14265059
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Noble Paul commented on SOLR-6892:
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[~arafalov] I'm glad that you are asking the right questions
This is not a 5.0 feature. This will only be taken up post 5.0. I'm just
getting the design right
> Make it possible to define update request processors as toplevel components
> ----------------------------------------------------------------------------
>
> Key: SOLR-6892
> URL: https://issues.apache.org/jira/browse/SOLR-6892
> Project: Solr
> Issue Type: Improvement
> 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
> * A new tag <updateProcessor> 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. The {{<updateProcessorChain>}} tag will
> continue to exist and it should be possible to define <processor> inside as
> well . It should also be possible to reference a named URP in a chain.
> * 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 URPs
> * Some in built update processors (wherever possible) will be predefined with
> standard names and can be directly used in requests
> * What happens when I say processor=a,b,c in a request? It will execute the
> default chain after the just-in-time chain {{a->b->c}} .
> * How to execute a different chain other than the default chain? the same old
> mechanism of update.chain=x means that the chain {{x}} will be applied after
> {{a,b,c}}
> * How to avoid the default processor chain from being executed ? There will
> be an implicit URP called {{STOP}} . send your request as
> processor=a,b,c,STOP.
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