Saavan Nanavati created BEAM-10782:
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Summary: Check that outputs are valid iterables when using the
performance runtime type check feature
Key: BEAM-10782
URL: https://issues.apache.org/jira/browse/BEAM-10782
Project: Beam
Issue Type: Improvement
Components: sdk-py-core
Reporter: Saavan Nanavati
Currently, when using the performance runtime type check feature, you can yield
invalid iterables from a DoFn and not have an error thrown. This is incorrect
behavior.
We should throw a TypeCheckError if the iterable type is any of the following:
dict, str, unicode, or bytes.
Previously, we tried doing this isinstance check in process_outputs of
common.py, however this harms performance significantly. We should search for a
cheaper way to verify that the output type is valid.
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