[issue37294] concurrent.futures.ProcessPoolExecutor state=finished raised error

[DanilZ]

DanilZ <danil.com at me.com> added the comment:

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> On 1 Oct 2020, at 03:11, Kyle Stanley <report at bugs.python.org> wrote:
> 
> 
> Kyle Stanley <aeros167 at gmail.com> added the comment:
> 
> DanilZ, could you take a look at the superseding issue (https://bugs.python.org/issue37297) and see if your exception raised within the job is the same?  
> 
> If it's not, I would suggest opening a separate issue (and linking to it in a comment here), as I don't think it's necessarily related to this one. "state=finished raised error" doesn't indicate the specific exception that occurred. A good format for the name would be something along the lines of:
> 
> "ProcessPoolExecutor.submit() <specific exception name here> while reading large object (4GB)"
> 
> It'd also be helpful in the separate issue to paste the full exception stack trace, specify OS, and multiprocessing start method used (spawn, fork, or forkserver). This is necessary to know for replicating the issue on our end.
> 
> In the meantime, I workaround I would suggest trying would be to use the  *chunksize* parameter (or *Iterator*) in pandas.read_csv(), and split it across several jobs (at least 4+, more if you have additional cores) instead of within a single one. It'd also be generally helpful to see if that alleviates the problem, as it could possibly indicate an issue with running out of memory when the dataframe is converted to pickle format (which often increases the total size) within the process associated with the job.
> 
> ----------
> nosy: +aeros
> 
> _______________________________________
> Python tracker <report at bugs.python.org>
> <https://bugs.python.org/issue37294>
> _______________________________________

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue37294>
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