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https://issues.apache.org/jira/browse/SOLR-3424?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13264986#comment-13264986
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Uwe Schindler commented on SOLR-3424:
-------------------------------------

Thanks! Thaks for taking care, as I have no time to provide a patch at the 
moment :(

bq. but I will since it seems to be a big deal to you (three exclamation points)

:-) It's not so important, if it's private to the class! I just don't want 
public code to expose Collections not intended to be modified in a modifiable 
way, so i am fine with or without unmodifiable. There are also places in Lucene 
violating this (or use public arrays, which cannot be protected - like 
CompositeReader.getSequentialSubReaders()).
                
> 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
>
>
> 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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