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From "Joel Bernstein (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-4465) Configurable Collectors
Date Fri, 22 Feb 2013 17:14:13 GMT

    [ https://issues.apache.org/jira/browse/SOLR-4465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13584447#comment-13584447
] 

Joel Bernstein commented on SOLR-4465:
--------------------------------------

Here is how custom collectors work:

There is a new "collectorFactory" element in solrconfing.xml. The design was deliberately
kept very simple:

<collectorFactory name="default" class="solr.CollectorFactory"/>

There can be multiple collectorFactory elements defined. The "name" attribute is used as a
handle to dynamically select a specific CollectorFactory implementation at query time. The
"class" attribute is a subclass of org.apache.solr.core.CollectorFactory which defines the
logic for creating the collector used for a specific query. The base class provides an implementation
with default logic for choosing between the TopScoreDocCollector and TopFieldCollector. 

There are also new collector parameters that allow the user to select a collector factory
by name with the following syntax:

cl.name=<name>

All parameters that begin with "cl." will be gathered up and passed to the CollectorFactory
through the QueryCommand. These parameters can be used to dynamically configure collector
algorithms at query time.




                
> Configurable Collectors
> -----------------------
>
>                 Key: SOLR-4465
>                 URL: https://issues.apache.org/jira/browse/SOLR-4465
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>    Affects Versions: 4.1
>            Reporter: Joel Bernstein
>             Fix For: 4.2, 5.0
>
>         Attachments: SOLR-4465.patch, SOLR-4465.patch, SOLR-4465.patch, SOLR-4465.patch,
SOLR-4465.patch, SOLR-4465.patch
>
>
> This issue is to add configurable custom collectors to Solr. This expands the design
and work done in issue SOLR-1680 to include:
> 1) CollectorFactory configuration in solconfig.xml
> 2) Http parameters to allow clients to dynamically select a CollectorFactory and construct
a custom Collector.
> 3) Make aspects of QueryComponent pluggable so that the output from distributed search
can conform with custom collectors at the shard level.

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