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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12656732#action_12656732
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Mark Miller commented on LUCENE-1483:
-------------------------------------

Thanks Mike. Yup - that says enough for me. We have to get ords working. I 
don't think ords will get faster though (you wouldnt surprise me though), I 
think they will get slower. Certainly they should stay much faster than value 
though - what a dog. But who knows - we can test fall back to value compare 
instead of subords as well. My naive ords attempt now is keeping previous 
mapping ords order by multiplying it as we move to new readers - thats going to 
explode into some very large numbers pretty fast, and I don't expect we can get 
by so easily. Either fall back to value will be good enough, or we will prob 
have to map to new ords rather than simple multiplying to retain each stages 
ording.

I'll keep playing with the ord on my end though - i only got it to pass those 
tests moments before that patch went up. I try to keep a frantic pace because I 
never know if my spare cycles will go away - I have juggled a defensive plate 
for a while :) No doubt I'll squeeze some more hours tonight though. 

> 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, 
> 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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