SpecificData.getSchema not thread-safe
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                 Key: AVRO-607
                 URL: https://issues.apache.org/jira/browse/AVRO-607
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.3.3
            Reporter: Stephen Tu
            Priority: Minor


SpecificData.getSchema uses a WeakHashMap to cache schemas, but WeakHashMap is 
not thread-safe, and the method itself is not synchronized. Seems like this 
could lead to the data structure getting corrupted. 

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