Rohini Palaniswamy created PIG-4806:
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Summary: UDFContext can be overwritten with empty properties in
the task for inputs and outputs during initialization
Key: PIG-4806
URL: https://issues.apache.org/jira/browse/PIG-4806
Project: Pig
Issue Type: Bug
Reporter: Rohini Palaniswamy
Assignee: Rohini Palaniswamy
Fix For: 0.16.0
We reinitialize UDFContext ThreadLocal itself in PigProcessor.initialize().
PigProcessor.initialize() is run in parallel with threads that do
MRInput.initialize() and MROutput.initialize(). It can overwrite the
initialized values in the input and output half way through. This can lead to
exceptions if the property stored in UDFContext is mandatory and task will be
retried which is ok. If it is not mandatory and it ends up getting null when it
actually had a value, wrong data can be produced silently.
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