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https://issues.apache.org/jira/browse/SOLR-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12793295#action_12793295
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Andrzej Bialecki commented on SOLR-1632:
-----------------------------------------
Shard.purpose is set by a concrete implementation of the DFSource, so I guess
your question is "how to turn ExactDFSource on/off"? If that's the case, then
put this in your solrconfig.xml:
{code:xml}
<globalIDF class="org.apache.solr.search.ExactDFCache"/>
{code}
> Distributed IDF
> ---------------
>
> Key: SOLR-1632
> URL: https://issues.apache.org/jira/browse/SOLR-1632
> Project: Solr
> Issue Type: New Feature
> Components: search
> Affects Versions: 1.5
> Reporter: Andrzej Bialecki
> Attachments: distrib.patch
>
>
> Distributed IDF is a valuable enhancement for distributed search across
> non-uniform shards. This issue tracks the proposed implementation of an API
> to support this functionality in Solr.
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