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https://issues.apache.org/jira/browse/LUCENE-3656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler updated LUCENE-3656:
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Attachment: LUCENE-3656.patch
Simple patch.
I had to add some additional synchronization in the notifier, as the iterators
are not thread-safe. Collections.synchronized*() returns a set, thats synced on
itsself, so you can for more complex changes like iteration, sync on the result
(the Set itsself), see for complete explanation:
[http://docs.oracle.com/javase/1.5.0/docs/api/java/util/Collections.html#synchronizedSet(java.util.Set)]
> IndexReader's add/removeCloseListener should not use ConcurrentHashMap, just
> a synchronized set
> -----------------------------------------------------------------------------------------------
>
> Key: LUCENE-3656
> URL: https://issues.apache.org/jira/browse/LUCENE-3656
> Project: Lucene - Java
> Issue Type: Bug
> Components: core/index
> Affects Versions: 3.5, 4.0
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Priority: Minor
> Labels: curiosity
> Attachments: LUCENE-3656.patch
>
>
> The use-case for ConcurrentHashMap is when many threads are reading and less
> writing to the structure. Here this is just funny: The only reader is
> close(). Here you can just use a synchronized HashSet. The complexity of CHM
> is making this just a joke :-)
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