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https://issues.apache.org/jira/browse/SOLR-3424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13265862#comment-13265862
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David Smiley commented on SOLR-3424:
------------------------------------
Uwe: Excellent catch RE my "static" bug, and I agree on your improvement RE
clazz & null.
I tried to ascertain the thread-safety status of Commons-Codec and
unfortunately I don't think we can assume it's thread-safe. I sent an email to
their list about this just now:
http://apache-commons.680414.n4.nabble.com/Thread-safety-of-Commons-Codec-Encoder-tt4600956.html
So I agree that we'll have to insatiate one of these in our create() method
instead of caching it.
> PhoneticFilterFactory threadsafety bug
> --------------------------------------
>
> Key: SOLR-3424
> URL: https://issues.apache.org/jira/browse/SOLR-3424
> Project: Solr
> Issue Type: Bug
> Components: Schema and Analysis
> Affects Versions: 3.6, 4.0
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Minor
> Fix For: 4.0
>
> Attachments: SOLR-3424_PhoneticFilterFactory_threadsafety_bug.patch,
> SOLR-3424_PhoneticFilterFactory_threadsafety_bug.patch,
> SOLR-3424_PhoneticFilterFactory_threadsafety_bug.patch,
> SOLR-3424_PhoneticFilterFactory_threadsafety_bug.patch
>
>
> PhoneticFilterFactory has a static HashMap registry mapping an encoder name
> to an implementation. There is a ReentrantLock used when the map is modified
> (when the encoder config specifies a class name). However, this map, which
> can be accessed by multiple indexing threads, isn't guarded on any of the
> reads, which isn't just the common path but also the error messages which
> dump the registry into the error message.
> I realize the likelihood of a problem is extremely slim, but a bug's a bug.
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