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https://issues.apache.org/jira/browse/LUCENE-6814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael McCandless resolved LUCENE-6814.
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Resolution: Fixed
If we ever do another 4.10.x release we should backport this one ...
> PatternTokenizer indefinitely holds heap equal to max document it has ever
> tokenized
> ------------------------------------------------------------------------------------
>
> Key: LUCENE-6814
> URL: https://issues.apache.org/jira/browse/LUCENE-6814
> Project: Lucene - Core
> Issue Type: Bug
> Reporter: Michael McCandless
> Assignee: Michael McCandless
> Fix For: Trunk, 5.4
>
> Attachments: LUCENE-6814.patch, LUCENE-6814.patch
>
>
> Caught by Alex Chow in this Elasticsearch issue:
> https://github.com/elastic/elasticsearch/issues/13721
> Today, PatternTokenizer reuses a single StringBuilder, but it doesn't free
> its heap usage after tokenizing is done. We can either stop reusing, or ask
> it to {{.trimToSize}} when we are done ...
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