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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656488#action_12656488
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Mark Miller commented on LUCENE-1483:
-------------------------------------

bq. One problem is that putting an ord "inbetween" isn't good enough since you 
may be mapping many values. 

bq. I don't like that added if, though, it should be rare

Not rare right? Let say there are 20 values in the queue, and now the new 
reader has 2 values. Lots will map to the same index.

I'm still digesting the rest of what yonik said. I don't have this String ord 
stuff working 100%, but I have it working sort of (seems to sort pieces right, 
but then the pieces are out of order). I don't think the precision exists to do 
what I'm doing anyway, but since it kind of works, I could prob bench the diff 
of using values rather than ords.

> Change IndexSearcher to use MultiSearcher semantics for multiple subreaders
> ---------------------------------------------------------------------------
>
>                 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, LUCENE-1483.patch, LUCENE-1483.patch, 
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, 
> LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch, LUCENE-1483.patch
>
>
> FieldCache and Filters are forced down to a single segment reader, allowing 
> for individual segment reloading on reopen.

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