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https://issues.apache.org/jira/browse/LUCENE-1707?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12724256#action_12724256
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Yonik Seeley commented on LUCENE-1707:
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bq. Do you think that changing ensureOpen() to check "if (refCount == 0)" will
speed things up a bit?
Nope - not on any common CPUs. There is normally a test instruction which sets
a bunch of status flags - branching on those status flags for less-or-equal is
the same exact cycle count as equal.
> 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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