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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654940#action_12654940
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Doug Cutting commented on LUCENE-1483:
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> make a HitCollector that gathers the results into a single pqueue

That's good when everything's local, but bad when things are distributed.  If 
we movE RemoteSearchable to contrib (as discussed in LUCENE-1314) then this may 
not be a problem, but we might still leave hooks so that someone can write a 
search that uses a separate top-queue per remote segment.

> Change IndexSearcher to use MultiSearcher semantics for sorted searches
> -----------------------------------------------------------------------
>
>                 Key: LUCENE-1483
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1483
>             Project: Lucene - Java
>          Issue Type: Improvement
>    Affects Versions: 2.9
>            Reporter: Mark Miller
>            Priority: Minor
>         Attachments: LUCENE-1483.patch
>
>
> Here is a quick test patch. FieldCache for sorting is done at the individual 
> IndexReader level and reloading the fieldcache on reopen can be much faster 
> as only changed segments need to be reloaded.

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