[GitHub] kkolman opened a new pull request #7139: [FLINK-10925] [python] Fix NPE in PythonPlanStreamer

[GitBox <gi...@apache.org>]

kkolman opened a new pull request #7139: [FLINK-10925] [python] Fix NPE in PythonPlanStreamer
URL: https://github.com/apache/flink/pull/7139
 
 
   ## What is the purpose of the change
   
   This pull requests makes it easier to troubleshoot Python Batch API issues that would happen when trying to run a Python Batch API job without Python installed.
   
   ## Brief change log
   
     - added *PythonPlanStreamer* check for null value before calling close method on an instance variable
   
   ## Verifying this change
   
   This change is a trivial rework / code cleanup without any test coverage.
   
     - Manually verified the change by submitting a Python Batch API job to cluster not having python installed
    - the job failed with an explanatory error message "**Failed to run plan: python does not point to a valid python binary.**"
   - prior to this fix the job would fail with a confusing "**Failed to run plan: null**" message.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): no
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: no
     - The serializers: no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
     - Does this pull request introduce a new feature? no
   

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