PyFlink 作业TaskManager 日志文件的示例是什么？

有些错误直到作业运行的过程中才会发生，比如脏数据或者 Python 自定义函数的实现问题等，针对这种错误，通常需要查看 TaskManager 的日志文件，比如以下错误反映用户在 Python 自定义函数中访问的 opencv 库不存在。

Caused by: java.lang.RuntimeException: Error received from SDK harness for instruction 2: Traceback (most recent call last):
  File "/Users/dianfu/venv/pyflink-usecases/lib/python3.8/site-packages/apache_beam/runners/worker/sdk_worker.py", line 253, in _execute
    response = task()
  File "/Users/dianfu/venv/pyflink-usecases/lib/python3.8/site-packages/apache_beam/runners/worker/sdk_worker.py", line 310, in <lambda>
    lambda: self.create_worker().do_instruction(request), request)
  File "/Users/dianfu/venv/pyflink-usecases/lib/python3.8/site-packages/apache_beam/runners/worker/sdk_worker.py", line 479, in do_instruction
    return getattr(self, request_type)(
  File "/Users/dianfu/venv/pyflink-usecases/lib/python3.8/site-packages/apache_beam/runners/worker/sdk_worker.py", line 515, in process_bundle
    bundle_processor.process_bundle(instruction_id))
  File "/Users/dianfu/venv/pyflink-usecases/lib/python3.8/site-packages/apache_beam/runners/worker/bundle_processor.py", line 977, in process_bundle
    input_op_by_transform_id[element.transform_id].process_encoded(
  File "/Users/dianfu/venv/pyflink-usecases/lib/python3.8/site-packages/apache_beam/runners/worker/bundle_processor.py", line 218, in process_encoded
    self.output(decoded_value)
  File "apache_beam/runners/worker/operations.py", line 330, in apache_beam.runners.worker.operations.Operation.output
  File "apache_beam/runners/worker/operations.py", line 332, in apache_beam.runners.worker.operations.Operation.output
  File "apache_beam/runners/worker/operations.py", line 195, in apache_beam.runners.worker.operations.SingletonConsumerSet.receive
  File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 71, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
  File "pyflink/fn_execution/beam/beam_operations_fast.pyx", line 85, in pyflink.fn_execution.beam.beam_operations_fast.FunctionOperation.process
  File "pyflink/fn_execution/coder_impl_fast.pyx", line 83, in pyflink.fn_execution.coder_impl_fast.DataStreamFlatMapCoderImpl.encode_to_stream
  File "/Users/dianfu/code/src/github/pyflink-usecases/datastream_api_demo.py", line 26, in split
    import cv2
ModuleNotFoundError: No module named 'cv2'

    at org.apache.beam.runners.fnexecution.control.FnApiControlClient$ResponseStreamObserver.onNext(FnApiControlClient.java:177)
    at org.apache.beam.runners.fnexecution.control.FnApiControlClient$ResponseStreamObserver.onNext(FnApiControlClient.java:157)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.stub.ServerCalls$StreamingServerCallHandler$StreamingServerCallListener.onMessage(ServerCalls.java:251)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.ForwardingServerCallListener.onMessage(ForwardingServerCallListener.java:33)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.Contexts$ContextualizedServerCallListener.onMessage(Contexts.java:76)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailableInternal(ServerCallImpl.java:309)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ServerCallImpl$ServerStreamListenerImpl.messagesAvailable(ServerCallImpl.java:292)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ServerImpl$JumpToApplicationThreadServerStreamListener$1MessagesAvailable.runInContext(ServerImpl.java:782)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.ContextRunnable.run(ContextRunnable.java:37)
    at org.apache.beam.vendor.grpc.v1p26p0.io.grpc.internal.SerializingExecutor.run(SerializingExecutor.java:123)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    ... 1 more