[jira] [Created] (PIG-4806) UDFContext can be overwritten with empty properties in the task for inputs and outputs during initialization

["Rohini Palaniswamy (JIRA)" <ji...@apache.org>]

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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