[AVRO-1220] Dead lock

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.7.3
• Fix Version/s: 1.7.4
• Component/s: java

Environment

OSX, JDK6

• Assignee: Doug Cutting
• Reporter: Stéphane Landelle
• Created: 13/Dec/12 21:52
• Updated: 27/Feb/13 00:54
• Resolved: 09/Feb/13 00:22

Description

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