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https://issues.apache.org/jira/browse/LUCENE-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724296#action_12724296
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Michael McCandless commented on LUCENE-1707:
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bq. Following assert we call ensureOpen, so I don't think refCount will ever be
less than 0. Right?
Heh, you are correct! The only place where we change refCount, we also always
call ensureOpen. So there's [currently] no way for it to slip past zero
without ensureOpen noticing.
Still I'd prefer to leave it, defensively, eg in case things ever change such
that refCount could become negative.
> Don't use ensureOpen() excessively in IndexReader and IndexWriter
> -----------------------------------------------------------------
>
> Key: LUCENE-1707
> URL: https://issues.apache.org/jira/browse/LUCENE-1707
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Shai Erera
> Fix For: 2.9
>
> Attachments: LUCENE-1707.patch, LUCENE-1707.patch
>
>
> A spin off from here:
> http://www.nabble.com/Excessive-use-of-ensureOpen()-td24127806.html.
> We should stop calling this method when it's not necessary for any internal
> Lucene code. Currently, this code seems to hurt properly written apps,
> unnecessarily.
> Will post a patch soon
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