Remi Catherinot created PIG-4581:
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Summary: thread safe issue in NodeIdGenerator
Key: PIG-4581
URL: https://issues.apache.org/jira/browse/PIG-4581
Project: Pig
Issue Type: Bug
Components: impl
Affects Versions: 0.14.0
Environment: any computer with multiple cores, does not always happen
since it is not a determinitic bug. The more threads and real cpu, the more
chances it will happen.
Reporter: Remi Catherinot
Priority: Trivial
NodeIdGenerator use an HashMap without any synchronization. In multithreaded
environment it may lead to concurrent access to the HashMap which, in some
case, triggers an infinite loop inside the HashMap implementation => the
parsing of the pig request never ends so the job will never run + it eats a
threads in the JVM that just keep burning CPU cycles.
since it is hard to reproduce and it is not a deterministic bug it is
impossible to provide a viable unit tests for it to demonstrate both the bug
and the fix.
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