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https://issues.apache.org/jira/browse/LUCENE-3644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-3644.
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Resolution: Fixed
> problems with IR's readerFinishedListener
> -----------------------------------------
>
> Key: LUCENE-3644
> URL: https://issues.apache.org/jira/browse/LUCENE-3644
> Project: Lucene - Java
> Issue Type: Bug
> Reporter: Robert Muir
> Assignee: Robert Muir
> Fix For: 3.6, 4.0
>
> Attachments: LUCENE-3644.patch, LUCENE-3644.patch, LUCENE-3644.patch
>
>
> There are two major problems:
> 1. The listener api does not really apply all indexreaders. for example
> segmentreaders dont fire it on close, only segmentcorereaders. this is wrong,
> a segmentcorereader is *not* an indexreader. Furthermore, if you register it
> on a top-level reader you get events for anything under the reader tree
> (sometimes, unless they are segmentreaders as mentioned above, where it
> doesnt work correctly at all).
> 2. Furthermore your listener is 'passed along' in a viral fashion from
> clone() and reopen(). This means for example, if you are trying to listen to
> readers in NRT search you are just accumulating reader listeners, all
> potentially keeping references to old indexreaders (because, in order to deal
> with #1 your listener must 'keep' a reference to the IR it was registered on,
> so it can check if thats *really* the one).
> We should discuss how to fix #1.
> I will create a patch for #2 shortly and commit it, its just plain wrong.
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