[issue13751] multiprocessing.pool hangs if any worker raises an Exception whose constructor requires a parameter

[Faheem Mitha]

Faheem Mitha <faheem at faheem.info> added the comment:

This is an issue with SQLAlchemy exceptions, and has been worked around by Mike Bayer in http://www.sqlalchemy.org/trac/ticket/2371

For the record, I think the real problem is that Python exception pickling is broken, see http://bugs.python.org/issue1692335

It would be nice to see this fixed, otherwise this issue will continue to plague the Python standard libraries as well as other libraries. Library writers don't seem to be aware of the issue.

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