[jira] Assigned: (LUCENE-1186) [PATCH] Clear ThreadLocal instances in close()

["Michael McCandless (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael McCandless reassigned LUCENE-1186:
------------------------------------------

    Assignee: Michael McCandless

> [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
>            Assignee: Michael McCandless
>            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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