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https://issues.apache.org/jira/browse/LUCENE-937?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14251101#comment-14251101
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David Smiley commented on LUCENE-937:
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In LUCENE-6033 I swapped LL for ArrayList purely for reduced memory usage
(fewer objects).
> Make CachingTokenFilter faster
> ------------------------------
>
> Key: LUCENE-937
> URL: https://issues.apache.org/jira/browse/LUCENE-937
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Mark Miller
> Priority: Minor
> Attachments: CachingTokenFilter.patch, CachingTokenFilterRev2.patch
>
>
> The LinkedList used by CachingTokenFilter is accessed using the get() method.
> Direct access on a LinkedList is slow and an Iterator should be used instead.
> For more than a handful of tokens, the difference in speed grows
> exponentially.
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