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https://issues.apache.org/jira/browse/LUCENE-4474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13473336#comment-13473336
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Uwe Schindler commented on LUCENE-4474:
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We should do this check in all cases! If there is only <=1 entry in the map, we
don't need to do anything (because this is the live thread!).
> CloseableThreadLocal maybePurge could be too expensive
> ------------------------------------------------------
>
> Key: LUCENE-4474
> URL: https://issues.apache.org/jira/browse/LUCENE-4474
> Project: Lucene - Core
> Issue Type: Task
> Reporter: Robert Muir
>
> Was doing some tests with geonames database (19 fields, just using
> StandardAnalyzer), and noticed this in the profiler.
> It could be a ghost, but we should investigate anyway.
> It seems ridiculous for a situation like mine:
> * indexing with one thread
> * every 40 Analyzer.tokenStream() calls [basically every other doc], this
> thing is called
> * it gets iterators over the map, checks threads, this and that. but of
> course there is only one thread!
> Maybe its a good idea if it checks size() first or something. at least dont
> do this stuff if size() == 1, as I bet a lot of people index with a single
> thread.
> Or maybe all this stuff is really cheap and its just a ghost.
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