[FLINK-14479] Strange exceptions found in log file after executing `test_udf.py`

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 1.16.0
• Component/s: API / Python
• Labels: auto-deprioritized-major auto-unassigned
• Assignee: Unassigned
• Reporter: sunjincheng
• Created: 21/Oct/19 13:54
• Updated: 12/May/22 12:30
• Resolved: 12/May/22 12:30

Description

There are several strange exceptions as follow in `${flink_source}/build-target/log/flink-${username}python-udf-boot${machine_name}.local.log` after executing `${flink_source}/flink-python/pyflink/table/tests/test_udf.py`:

Traceback (most recent call last):

 File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/runpy.py", line 193, in _run_module_as_main
 "__main__", mod_spec)
 File "/usr/local/Cellar/python/3.7.4/Frameworks/Python.framework/Versions/3.7/lib/python3.7/runpy.py", line 85, in _run_code
 exec(code, run_globals)
 File "/Users/zhongwei/flink/flink-python/pyflink/fn_execution/sdk_worker_main.py", line 30, in <module>
 apache_beam.runners.worker.sdk_worker_main.main(sys.argv)
 File "/Users/zhongwei/pyflink_env/py37/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker_main.py", line 148, in main
 sdk_pipeline_options.view_as(pipeline_options.ProfilingOptions))
 File "/Users/zhongwei/pyflink_env/py37/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 133, in run
 for work_request in control_stub.Control(get_responses()):
 File "/Users/zhongwei/pyflink_env/py37/lib/python3.7/site-packages/grpc/_channel.py", line 364, in __next__
 return self._next()
 File "/Users/zhongwei/pyflink_env/py37/lib/python3.7/site-packages/grpc/_channel.py", line 347, in _next
 raise self
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
 status = StatusCode.CANCELLED
 details = "Runner closed connection"
 debug_error_string = "{"created":"@1571660342.057172000","description":"Error received from peer ipv6:[::1]:52699","file":"src/core/lib/surface/call.cc","file_line":1052,"grpc_message":"Runner closed connection","grpc_status":1}"

It appears randomly when executing test cases of blink planner. Although it does not affect test results we need to find out why it appears.

Welcome any feedback!