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https://issues.apache.org/jira/browse/SOLR-1093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Karthick Duraisamy Soundararaj updated SOLR-1093:
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Attachment: SOLR-1093.patch
I have created a new class MultiSearchHandler which is an extension of
SearchHandler. It takes all the parameters that a SearchHandler can take and
parses them into sub queries(LocalSolrQueryRequests). It then executes each of
these sub queries serially using the SearchHandler. It doesnt enforce
IndexSearcher consistency amongnst multiple queries within the same request
(This doesnt harm us and is infact good for our usecase).
Usage
To pass a parameter an individual query, it should be prefixed with the query
number
Eg. 1.q=”query1”&2.q=”query2”….
To pass a parameter to all queries, the prefix shouldn’t be specified
Eg. count=2&query=”query1”&1.mm=3&2.mm=2….
New query parameters specific to MultiSearchHandler
In addition to all the parameters that a SearchHandler can accept, the
following query parameters can be passed to the MultiSearchHandler
Query parameter that can be used both as common & specific to each individual
query
threshold - The minimum number of matches(numFound) for a query. Default
value is -1 .
Query parameter common to all the sub queries
count - Count of the queries in the url . This
parameter is mandatory
skiponfailure - Boolean parameter that specifies whether or not to include the
results of queries whose numFound is less than threshold. This parameter is
optional.
stoponpass - Boolean parameter that specifies whether or not to stop
executing if the query if first subquery has result count greater than the
threshold. This parameter is optional.
> 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
> Fix For: 4.0
>
> 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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