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https://issues.apache.org/jira/browse/SOLR-4465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13592576#comment-13592576
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Joel Bernstein commented on SOLR-4465:
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Dan,
This patch doesn't work with grouping because grouping is done within a
separate flow with a separate set of collectors. SOLR-1680 was a custom
collectors patch that was meant to allow grouping to be merged into the main
flow, but was never committed. Possibly grouping could be implemented using a
collector factory but that would be a follow-on to getting this as part of the
core.
I'll work on resolving the npe with the default collector in the next patch.
As you mentioned the caching implications here need to be fully understood.
Perhaps you could elaborate on "Additionally since the collector is free to
alter results between requests". Can you explain the use case where this would
occur?
> 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, 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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