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https://issues.apache.org/jira/browse/LUCENE-1186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12677423#action_12677423
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Robert Starzer commented on LUCENE-1186:
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you could use e.g. spring and specific spring-bean-scopes [spring isn't the
only choice ;-) ]
(e.g. request/session scope for web apps, thread local scope (via
org.springframework.aop.target.ThreadLocalTargetSource) for none-web apps), or
even prototyp scope if nothing
should be reused
the main problem however is that i do not know why ThreadLocal objects are used
in lucene; i somewhere read about synchronization issues, but IMHO only the
developer/user knows
if synchronization is really necessary;
could you please explain to me why/when ThreadLocals are used?
> [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
> Fix For: 2.4.1, 2.9
>
> Attachments: LUCENE-1186-SegmentReader.patch, LUCENE-1186.patch,
> LUCENE-1186.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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