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https://issues.apache.org/jira/browse/LUCENE-3776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13210337#comment-13210337
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Michael McCandless commented on LUCENE-3776:
--------------------------------------------
Thanks Shai -- I'll share a common (static) getSearcher. I think assert only
makes it safer, eg in case someone changes something in the future that somehow
lets a non-DR in or something...
> NRTManager shouldn't expose its private SearcherManager
> -------------------------------------------------------
>
> Key: LUCENE-3776
> URL: https://issues.apache.org/jira/browse/LUCENE-3776
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Blocker
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3776.patch, LUCENE-3776.patch, LUCENE-3776.patch
>
>
> Spinoff from LUCENE-3769.
> To actually obtain an IndexSearcher from NRTManager, it's a 2-step process
> now.
> You must .getSearcherManager(), then .acquire() from the returned
> SearcherManager.
> This is very trappy... because if the app incorrectly calls maybeReopen on
> that private SearcherManager (instead of NRTManager.maybeReopen) then it can
> unexpectedly cause threads to block forever, waiting for the necessary gen to
> become visible. This will be hard to debug... I don't like creating trappy
> APIs.
> Hopefully once LUCENE-3761 is in, we can fix NRTManager to no longer expose
> its private SM, instead subclassing ReferenceManaager.
> Or alternatively, or in addition, maybe we factor out a new interface
> (SearcherProvider or something...) that only has acquire and release methods,
> and both NRTManager and ReferenceManager/SM impl that, and we keep
> NRTManager's SM private.
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