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https://issues.apache.org/jira/browse/SOLR-6892?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14362432#comment-14362432
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Noble Paul commented on SOLR-6892:
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I have added info level logging which says exactly the order of
Updateprocessors used
> Improve the way update processors are used and make it simpler
> --------------------------------------------------------------
>
> Key: SOLR-6892
> URL: https://issues.apache.org/jira/browse/SOLR-6892
> Project: Solr
> Issue Type: Improvement
> Reporter: Noble Paul
> Assignee: Noble Paul
> Attachments: SOLR-6892.patch
>
>
> 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.
> * processors will be added in the request with their names . Example
> {{processor=a,b,c}} , {{post-processor=x,y,z}} . This creates an implicit
> chain of the named URPs the order they are specified
> * There are multiple request parameters supported by update request
> ** processor : This chain is executed executed at the leader right before the
> LogUpdateProcessorFactory + DistributedUpdateProcessorFactory . The replicas
> will not execute this.
> ** post-processor : This chain is executed right before the
> RunUpdateProcessor in all replicas , including the leader
> * What happens to the update.chain parameter ? {{update.chain}} will be
> honored . The implicit chain is created by merging both the update.chain and
> the request params. {{post-processor}} will be inserted right before the
> {{RunUpdateProcessorFactory}} in the chain. and {{processor}} will be
> inserted right before the
> LogUpdateProcessorFactory,DistributedUpdateProcessorFactory
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