Stephan Hoyer commented on BEAM-3956:

Indeed, it looks losing stack-traces for the direct runner was introduced 
inadvertently by [https://github.com/apache/beam/pull/4376]

> Stacktraces from exceptions in user code should be preserved in the Python SDK
> ------------------------------------------------------------------------------
>                 Key: BEAM-3956
>                 URL: https://issues.apache.org/jira/browse/BEAM-3956
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-py-core
>            Reporter: Stephan Hoyer
>            Priority: Major
>          Time Spent: 6h 10m
>  Remaining Estimate: 0h
> Currently, Beam's Python SDK loses stacktraces for exceptions. It does 
> helpfully add a tag like "[while running StageA]" to exception error 
> messages, but that doesn't include the stacktrace of Python functions being 
> called.
> Including the full stacktraces would make a big difference for the ease of 
> debugging Beam pipelines when things go wrong.

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