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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12655036#action_12655036
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Mark Miller commented on LUCENE-1483:
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I also did a quick reopen alg. The speed gain on this can really vary depending
on index access patterns. I tried adding 500000 (very small) docs with a random
sort field. Then added 50000 docs and then reopen 10 times. Repeat all 4 times.
Comparison is of the time it takes to load the fieldcache and do one search.
With this patch it came out about 40-50% faster. Obviously going to depend on
many factors in real world though. In certain applications I'm sure it could be
many times faster or slower.
> 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
>
>
> 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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