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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12654839#action_12654839
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Michael McCandless commented on LUCENE-1483:
--------------------------------------------

I think there should be very little impact to performance, for single or multi 
segment indices, for the search itself against a warmed reader.  (And actually 
LUCENE-1471 should make things a wee bit faster, especially if n,m are 
largeish, though this will typically be in the noise).

But warming after reopen should be much faster with this patch (we should try 
to measure that too).

> 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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