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https://issues.apache.org/jira/browse/LUCENE-1329?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12611598#action_12611598
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Yonik Seeley commented on LUCENE-1329:
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bq. I think we should, at least in addition but perhaps instead, create a way
to open a read-only IndexReader.
Right... a volatile is still "half" a synchronized in many ways, and gets more
expensive as you add more cores. IAFAIK It's also something you won't see with
a profiler because it involves cache flushes, not explicit high level blocking.
> Remove synchronization in SegmentReader.isDeleted
> -------------------------------------------------
>
> Key: LUCENE-1329
> URL: https://issues.apache.org/jira/browse/LUCENE-1329
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Affects Versions: 2.3.1
> Reporter: Jason Rutherglen
> Priority: Trivial
> Attachments: lucene-1329.patch
>
>
> Removes SegmentReader.isDeleted synchronization by using a volatile
> deletedDocs variable on Java 1.5 platforms. On Java 1.4 platforms
> synchronization is limited to obtaining the deletedDocs reference.
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