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