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https://issues.apache.org/jira/browse/SOLR-303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12554534
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Otis Gospodnetic commented on SOLR-303:
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Shard is what you call a small(er) index that is a part of a large(r) cluster 
of indices.  These smaller shards together form one large logical index.

See http://www.scribd.com/doc/312186/THE-GOOGLE-CLUSTER-ARCHITECTURE

I wish Nutch used the same (shard) nomenclature instead of using "segments", so 
there is no confusion with Lucene index segments.... but that's another issue.


> Distributed Search over HTTP
> ----------------------------
>
>                 Key: SOLR-303
>                 URL: https://issues.apache.org/jira/browse/SOLR-303
>             Project: Solr
>          Issue Type: New Feature
>          Components: search
>            Reporter: Sharad Agarwal
>            Assignee: Yonik Seeley
>         Attachments: distributed.patch, distributed.patch, fedsearch.patch, 
> fedsearch.patch, fedsearch.patch, fedsearch.patch, fedsearch.patch, 
> fedsearch.patch, fedsearch.patch, fedsearch.stu.patch, fedsearch.stu.patch
>
>
> Searching over multiple shards and aggregating results.
> Motivated by http://wiki.apache.org/solr/DistributedSearch

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