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https://issues.apache.org/jira/browse/LUCENE-2163?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-2163.
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Resolution: Fixed
Fix Version/s: (was: 4.1)
4.0
5.0
> Remove synchronized from DirReader.reopen/clone
> -----------------------------------------------
>
> Key: LUCENE-2163
> URL: https://issues.apache.org/jira/browse/LUCENE-2163
> Project: Lucene - Core
> Issue Type: Improvement
> Components: core/index
> Reporter: Michael McCandless
> Priority: Minor
> Fix For: 5.0, 4.0
>
> Attachments: LUCENE-2163.patch
>
>
> Spinoff from LUCENE-2161, where the fact that DirReader.reopen is
> sync'd was dangerous in the context of NRT (could block all searches
> against that reader when CMS was throttling). So, with LUCENE-2161,
> we're removing the synchronization when it's an NRT reader that you're
> reopening.
> But... why should we sync even for a "normal" reopen? There are
> various sync'd methods on IndexReader/DirReader (we are reducing that,
> with LUCENE-2161 and also LUCENE-2156), but, in general it doesn't
> seem like "normal" reopen really needs to be sync'd. Performing a reopen
> shouldn't incur any chance of blocking a search...
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