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https://issues.apache.org/jira/browse/LUCENE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700784#action_12700784
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Mark Miller commented on LUCENE-1607:
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bq. The thread safety problem has to do with safe object publication
Oh, great, you mean basic concurrency competency :( Well thats an embarrassing
erosion of knowledge. Back to the books. Thread a has no happens before
relationship with thread b unless they share the lock. I trained myself to just
synchronize or use volatile long ago (and then let the knowledge begin seeping
I guess), but even still, every time I see one of these double lock check type
tricks I go, eh, this one must work or something.
> String.intern() faster alternative
> ----------------------------------
>
> Key: LUCENE-1607
> URL: https://issues.apache.org/jira/browse/LUCENE-1607
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Earwin Burrfoot
> Fix For: 2.9
>
> Attachments: intern.patch, LUCENE-1607.patch
>
>
> By using our own interned string pool on top of default, String.intern() can
> be greatly optimized.
> On my setup (java 6) this alternative runs ~15.8x faster for already interned
> strings, and ~2.2x faster for 'new String(interned)'
> For java 5 and 4 speedup is lower, but still considerable.
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