Stéphane Landelle created AVRO-1220:
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             Summary: Dead lock 
                 Key: AVRO-1220
                 URL: https://issues.apache.org/jira/browse/AVRO-1220
             Project: Avro
          Issue Type: Bug
          Components: java
    Affects Versions: 1.7.3
         Environment: OSX, JDK6
            Reporter: Stéphane Landelle


I experience a dead lock when running multiple DataFileReader in concurrent 
threads.
See test case here:
https://github.com/slandelle/avro-test

AvroBinaryEncodingTest randomly stalls about 50% of the time.
A thread dump would show a dead lock in org.apache.avro.io.parsing.Symbol class 
initialization.

IHMO, the problem is that the Symbol class has static final members that are 
instances of Symbol subclasses.

I built a custom version of avro where all the constants (NULL, BOOLEAN, INT, 
etc) have been extracted into a dedicated class outside of Symbol hierarchy and 
the test case now runs fine.

Cheers,

Stéphane Landelle

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