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From "Yonik Seeley (JIRA)" <>
Subject [jira] Commented: (LUCENE-1607) String.intern() faster alternative
Date Wed, 29 Apr 2009 18:57:32 GMT


Yonik Seeley commented on LUCENE-1607:

bq. As a quick comment on the implementation, i notice that it is possible (with reasonable
probability) for hash collisions to result in re-interning a pair of strings multiple times.

For the first implementation, yes.  The latest implementation is guaranteed to only intern
a string once ( the hashtable does probing and resizing.)

> String.intern() faster alternative
> ----------------------------------
>                 Key: LUCENE-1607
>                 URL:
>             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,
> By using our own interned string pool on top of default, String.intern() can be greatly
> 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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