[jira] [Created] (FLINK-6182) Fix possible NPE in SourceStreamTask

[Ufuk Celebi (JIRA)]

Ufuk Celebi created FLINK-6182:
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             Summary: Fix possible NPE in SourceStreamTask
                 Key: FLINK-6182
                 URL: https://issues.apache.org/jira/browse/FLINK-6182
             Project: Flink
          Issue Type: Bug
          Components: Local Runtime
            Reporter: Ufuk Celebi
            Priority: Minor


If SourceStreamTask is cancelled before being invoked, `headOperator` is not 
set yet, which leads to an NPE. This is not critical but leads to noisy logs.




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