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https://issues.apache.org/jira/browse/LUCENE-2943?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Robert Muir resolved LUCENE-2943.
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Resolution: Fixed
Committed revisions 1075850, 1076017 (branch_3x)
> ICU collator thread-safety issues
> ---------------------------------
>
> Key: LUCENE-2943
> URL: https://issues.apache.org/jira/browse/LUCENE-2943
> Project: Lucene - Java
> Issue Type: Bug
> Components: Analysis
> Reporter: Robert Muir
> Fix For: 3.1, 4.0
>
> Attachments: LUCENE-2943.patch, LUCENE-2943.patch, LUCENE-2943.patch
>
>
> The ICU Collators (unlike the JDK ones) aren't thread safe:
> http://userguide.icu-project.org/collation/architecture , a little
> non-obvious since its not mentioned
> in the javadocs, and its not clear if the docs apply to only the C code, but
> i looked
> at the source and there is all kinds of internal state.
> So in my opinion, we should clone the icu collators (which are passed in from
> the outside)
> when creating a new TokenStream/AttributeImpl to prevent problems. This
> shouldn't be a big
> deal since everything uses reusableTokenStream anyway.
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