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https://issues.apache.org/jira/browse/LUCENE-2156?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12790360#action_12790360
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Yonik Seeley commented on LUCENE-2156:
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ensureOpen() is to help catch coding mistakes, not to act in a completely
deterministic way. It should be as light weight as possible so correct
programs aren't penalized.
> use AtomicInteger/Boolean to track IR.refCount and IW.closed
> ------------------------------------------------------------
>
> Key: LUCENE-2156
> URL: https://issues.apache.org/jira/browse/LUCENE-2156
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-2156.patch, LUCENE-2156.patch
>
>
> Less costly than synchronized methods we have now...
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