[jira] [Created] (BEAM-1894) Race conditions in python direct runner eager mode

["Vikas Kedigehalli (JIRA)" <ji...@apache.org>]

Vikas Kedigehalli created BEAM-1894:
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             Summary: Race conditions in python direct runner eager mode
                 Key: BEAM-1894
                 URL: https://issues.apache.org/jira/browse/BEAM-1894
             Project: Beam
          Issue Type: Bug
          Components: sdk-py
            Reporter: Vikas Kedigehalli
            Assignee: Ahmet Altay
             Fix For: First stable release


test_eager_pipeline (https://github.com/apache/beam/blob/master/sdks/python/apache_beam/pipeline_test.py#L283) fails with the following error:
ERROR: test_eager_pipeline (apache_beam.pipeline_test.PipelineTest)
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Traceback (most recent call last):
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/pipeline_test.py", line 285, in test_eager_pipeline
    self.assertEqual([1, 4, 9], p | Create([1, 2, 3]) | Map(lambda x: x*x))
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/transforms/ptransform.py", line 387, in __ror__
    p.run().wait_until_finish()
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/pipeline.py", line 160, in run
    self.to_runner_api(), self.runner, self.options).run(False)
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/pipeline.py", line 169, in run
    return self.runner.run(self)
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/runners/direct/direct_runner.py", line 99, in run
    result.wait_until_finish()
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/runners/direct/direct_runner.py", line 166, in wait_until_finish
    self._executor.await_completion()
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/runners/direct/executor.py", line 336, in await_completion
    self._executor.await_completion()
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/runners/direct/executor.py", line 308, in __call__
    uncommitted_bundle.get_elements_iterable())
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/runners/direct/evaluation_context.py", line 176, in append_to_cache
    self._cache.append(applied_ptransform, tag, elements)
  File "/usr/local/google/home/vikasrk/work/incubator-beam/sdks/python/apache_beam/runners/direct/direct_runner.py", line 138, in append
    self._cache[(applied_ptransform, tag)].extend(elements)
TypeError: 'NoneType' object has no attribute '__getitem__'


This is triggered when Create is changed to a custom source. 



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