[jira] [Commented] (SOLR-1093) A RequestHandler to run multiple queries in a batch

["Gordon Mohr (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SOLR-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13648441#comment-13648441 ] 

Gordon Mohr commented on SOLR-1093:
-----------------------------------

I have a possibly-related desired use-case: I'd like to issue M multiple queries, get the top N results for each query, and for each result across all queries, get its score for each of the queries. (And of course I'd prefer to do this in one parallel index pass, rather than M serial passes.) 
                
> A RequestHandler to run multiple queries in a batch
> ---------------------------------------------------
>
>                 Key: SOLR-1093
>                 URL: https://issues.apache.org/jira/browse/SOLR-1093
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Noble Paul
>            Assignee: Simon Willnauer
>         Attachments: SOLR-1093.patch
>
>
> It is a common requirement that a single page requires to fire multiple queries .In cases where these queries are independent of each other. If there is a handler which can take in multiple queries , run them in paralll and send the response as one big chunk it would be useful
> Let us say the handler is  MultiRequestHandler
> {code}
> <requestHandler name="/multi" class="solr.MultiRequestHandler"/>
> {code}
> h2.Query Syntax
> The request must specify the no:of queries as count=n
> Each request parameter must be prefixed with a number which denotes the query index.optionally ,it may can also specify the handler name.
> example
> {code}
> /multi?count=2&1.handler=/select&1.q=a:b&2.handler=/select&2.q=a:c
> {code}
> default handler can be '/select' so the equivalent can be
> {code} 
> /multi?count=2&1.q=a:b&2.q=a:c
> {code}
> h2.The response
> The response will be a List<NamedList> where each NamedList will be a response to a query. 

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