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https://issues.apache.org/jira/browse/LUCENE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12700942#action_12700942
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Yonik Seeley commented on LUCENE-1607:
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bq. In no-collision resolution scheme, if you detect a collision early with
hashcode, you still call String.intern().
In the old code, yes... that's why I left it commented out there. In the
latest code, we re-probe on a collision w/o calling compareTo (assuming
hashCodes are unequal) and only call intern() if it's really a String we
haven't seen before. The new code is a real hash table that will store all the
Strings requested through it, unlike the first variant that was a simple cache.
> 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, LUCENE-1607.patch,
> LUCENE-1607.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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