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https://issues.apache.org/jira/browse/SOLR-3293?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13241248#comment-13241248
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David Smiley commented on SOLR-3293:
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I suspected you would be interested in this issue, Jan.

Yes, it could be as simple as an extends attribute there.  That was my initial 
idea.  Two other questions:
* Is there an implied default inherited request handler?  Here you could 
specify "df", "q.op", "f.myfieldname.facet.method", ...
* Could/should you be able to declare a handler that is only for extension and 
not for direct use?  If so then how would it be declared as such?
* multiple extended request handlers resulting in mixin capability?  -- e.g 
extends="base,foo,bar"  Or is this overkill?

There is something to be said for simplicity of how it works.  So maybe simply 
one parent, no way to prevent a search of a RH aside from avoiding a leading 
'/' (assuming handleSelect is disabled) which is good enough... and maybe no 
default extends since all the RH definitions declared in solrconfig.xml out of 
the box could refer to a base one.

This should be easy to implement.
                
> Request Handler inheritance
> ---------------------------
>
>                 Key: SOLR-3293
>                 URL: https://issues.apache.org/jira/browse/SOLR-3293
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: David Smiley
>
> It would be useful if one Solr request handler could inherit from another.  
> Or perhaps a mixin style so multiple could be merged in.  I've wanted to do 
> this to reduce repeating myself in solrconfig.xml RH configurations.  Maybe 
> all that's needed is one RH which provides the defaults to all the other 
> search handlers.  This feature could also be useful for establishing some 
> defaults like for "df" and "q.op" and "f.myfieldname.facet.method".

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