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https://issues.apache.org/jira/browse/SOLR-1632?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789379#action_12789379
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Otis Gospodnetic commented on SOLR-1632:
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I didn't look a the patch, but from your comments it looks like you already 
have that "1 merged big idf map", which is really what I was aiming at, so 
that's good!

I was just thinking that this map (file) would be periodically updated and 
pushed to slaves, so that slaves can compute the global IDF *locally* instead 
of any kind of extra requests.


> 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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