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Date: Tue, 9 Dec 2008 12:57:44 -0800 (PST)
From: "Michael McCandless (JIRA)" <jira@apache.org>
To: java-dev@lucene.apache.org
Subject: [jira] Commented: (LUCENE-1483) Change IndexSearcher to use
 MultiSearcher semantics for sorted searches
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    [ https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654962#action_12654962 ] 

Michael McCandless commented on LUCENE-1483:
--------------------------------------------

{quote}
>> 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.
{quote}

Good point; so this means we can't blindly do this optimization to MultiSearcher (w/o having option to do separate queues, merged in the end).  But for IndexSearcher(Multi*Reader).search it should be safe?

> 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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