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https://issues.apache.org/jira/browse/MAHOUT-706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13044336#comment-13044336
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Robert Muir commented on MAHOUT-706:
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right, Analyzer is thread-safe: the reused streams are stored in a threadlocal:
http://svn.apache.org/repos/asf/lucene/dev/trunk/lucene/src/java/org/apache/lucene/analysis/Analyzer.java
when you call reusableTokenStream(), it grabs the per-thread saved one and
calls reset() instead of creating a new one... creating a new one (all the
tokenstreams and attributes) is very heavy.
> reuse lucene tokenstreams
> -------------------------
>
> Key: MAHOUT-706
> URL: https://issues.apache.org/jira/browse/MAHOUT-706
> Project: Mahout
> Issue Type: Improvement
> Reporter: Robert Muir
> Assignee: Grant Ingersoll
> Priority: Minor
> Fix For: 0.6
>
> Attachments: MAHOUT-706.patch
>
>
> Currently, mahout uses Lucene's non-reusable analysis API.
> This means that per-"document", a lot of objects are recreated (e.g. every
> TokenStream in the analysis chain, every Attribute).
> This can create a lot of unnecessary overhead, particularly if "documents"
> are short.
> It looks like an easy win to use the reusable API (reusableTokenStream)
> instead.
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