[jira] [Created] (BEAM-10696) unable to explicitly use element coder in CombiningValueStateSpec constructor

["Heejong Lee (Jira)" <ji...@apache.org>]

Heejong Lee created BEAM-10696:
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             Summary: unable to explicitly use element coder in CombiningValueStateSpec constructor
                 Key: BEAM-10696
                 URL: https://issues.apache.org/jira/browse/BEAM-10696
             Project: Beam
          Issue Type: Bug
          Components: sdk-py-core
            Reporter: Heejong Lee


looks like the example:
 COUNT_STATE = CombiningValueStateSpec('count',
                                        VarIntCoder(),
                                        combiners.SumCombineFn())
in [https://beam.apache.org/blog/timely-processing/] doesn't work because of coder error.
{code:java}
Error message from worker: generic::unknown: Traceback (most recent call last):
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 256, in _execute
    response = task()
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 313, in <lambda>
    lambda: self.create_worker().do_instruction(request), request)
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 483, in do_instruction
    getattr(request, request_type), request.instruction_id)
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 518, in process_bundle
    bundle_processor.process_bundle(instruction_id))
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/bundle_processor.py", line 983, in process_bundle
    op.finish()
  File "apache_beam/runners/worker/operations.py", line 697, in apache_beam.runners.worker.operations.DoOperation.finish
  File "apache_beam/runners/worker/operations.py", line 699, in apache_beam.runners.worker.operations.DoOperation.finish
  File "apache_beam/runners/worker/operations.py", line 702, in apache_beam.runners.worker.operations.DoOperation.finish
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/bundle_processor.py", line 775, in commit
    state.commit()
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/bundle_processor.py", line 492, in commit
    self._underlying_bag_state.commit()
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/bundle_processor.py", line 553, in commit
    self._state_key, self._value_coder.get_impl(), self._added_elements)
  File "/usr/local/lib/python3.7/site-packages/apache_beam/runners/worker/sdk_worker.py", line 1012, in extend
    coder.encode_to_stream(element, out, True)
  File "apache_beam/coders/coder_impl.py", line 777, in apache_beam.coders.coder_impl.VarIntCoderImpl.encode_to_stream
  File "apache_beam/coders/coder_impl.py", line 779, in apache_beam.coders.coder_impl.VarIntCoderImpl.encode_to_stream
TypeError: an integer is required
{code}
The actual element type here was a list of int, not just int.

The API document mentions that
{code:java}
coder (Coder): Coder specifying how to encode the values to be combined.
  May be inferred.
{code}
which is seemingly wrong.



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