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https://issues.apache.org/jira/browse/LUCENE-1483?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12657476#action_12657476
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Doug Cutting commented on LUCENE-1483:
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> Woah! Don't make me switch all that again!
Sorry, I'm just tossing out ideas. Don't take me too seriously...
> The reason I lost the instanceof is that we would have to deprecate the
> HitCollector implementations because they need to extend HitCollector.
Would we? I was suggesting that, if we're going to have two APIs, one expert
and one non-expert, then we could make the expert API a subclass and not
deprecate or otherwise alter HitCollector. I do not like using exceptions for
normal control flow. Instanceof is better, but not ideal. A default
implementation of an expert method that returns 'false', as Mike suggested,
isn't bad and might be best. It requires neither deprecation, exceptions nor
instanceof. Would we have a subclass that overrides this that's used as a base
class for optimized implementations?
> 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, 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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