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https://issues.apache.org/jira/browse/LUCENE-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12572092#action_12572092
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Christian Kohlschütter commented on LUCENE-1186:
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This issue is rather a prophylactic one -- until now, I have not encountered an
OutOfMemoryError or slowdown etc.
However, I think it is a good practice to release all resources as soon as an
object is not used anymore. For SegmentReader, this is the case when #close()
is called. More, as noted in LUCENE-436, some VMs (also recent ones) indeed
seem to have problems when ThreadLocal values are not released, so I think it
is not just a cosmetic issue.
> [PATCH] Clear ThreadLocal instances in close()
> ----------------------------------------------
>
> Key: LUCENE-1186
> URL: https://issues.apache.org/jira/browse/LUCENE-1186
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.3, 2.3.1, 2.4
> Environment: any
> Reporter: Christian Kohlschütter
> Priority: Minor
> Attachments: LUCENE-1186-SegmentReader.patch
>
>
> As already found out in LUCENE-436, there seems to be a garbage collection
> problem with ThreadLocals at certain constellations, resulting in an
> OutOfMemoryError.
> The resolution there was to remove the reference to the ThreadLocal value
> when calling the close() method of the affected classes (see FieldsReader and
> TermInfosReader).
> For Java < 5.0, this can effectively be done by calling
> threadLocal.set(null); for Java >= 5.0, we would call threadLocal.remove()
> Analogously, this should be done in *any* class which creates ThreadLocal
> values
> Right now, two classes of the core API make use of ThreadLocals, but do not
> properly remove their references to the ThreadLocal value
> 1. org.apache.lucene.index.SegmentReader
> 2. org.apache.lucene.analysis.Analyzer
> For SegmentReader, I have attached a simple patch.
> For Analyzer, there currently is no patch because Analyzer does not provide a
> close() method (future to-do?)
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