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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655628#action_12655628
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Mark Miller commented on LUCENE-1483:
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bq. I think given this, we should cutover other search methods
(sort-by-relevance, custom HitCollector) to this approach? Maybe if we add a
new Scorer.score method that can accept a "docBase" which it adds into the
doc() before calling collect()? In fact, if we do that, we may not even need
the new MultiReaderTopFieldDocCollector at all?
I like this idea. I'd love to figure out how 'outside' systems could get the
reopen benefit as well (solr caches and such, beyond internal sorting). This
seems like a first step towards that possibility (though I admittedly don't see
a clear path yet).
bq. Hmm, though, a Scorer may override that score(HitCollector), eg
BooleanScorer does. Maybe we have to make a wrapper HitCollector that simply
adds in the docBase and then invokes the real HitCollector.collect after
shifting the docBase? Though that costs us an extra method call per collect().
Well, we might as well bench and see what we lose...
> 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, LUCENE-1483.patch, LUCENE-1483.patch,
> LUCENE-1483.patch, 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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