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https://issues.apache.org/jira/browse/LUCENE-2017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771520#action_12771520
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Michael McCandless commented on LUCENE-2017:
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I don't think using remove() is sufficient -- it only removes the
calling thread's entry, whereas we want all entries for any thread
that stored something into the ThreadLocal, to be eligible for GC when
close is called.
The problem is a live thread is slow(ish) to free its objects in a
ThreadLocal instance even when the ThreadLocal instance is GC'd. The
close method works around this.
> CloseableThreadLocal is now obsolete
> ------------------------------------
>
> Key: LUCENE-2017
> URL: https://issues.apache.org/jira/browse/LUCENE-2017
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 3.0
> Reporter: Cédrik LIME
> Attachments: CloseableThreadLocal.patch
>
>
> Since Lucene 3 depends on Java 5, we can use ThreadLocal#remove() to take
> care or resource management.
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