Fix stalling in Pipeline command #632
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When a command (other than the first) in a pipeline wrote more than 64k to the stderr, and the output was consumed with the iter_lines function, the whole pipeline stalled. Fixed by reading the output of all commands where either stdout or stderr was set to PIPE.
somehow stderr includes an empty line when run on pypy
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henryiii
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Nov 1, 2023
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@henryiii do you plan to release new version soon? Stalling pipelines is something we've bumped in several times, this fix seems important. I don't know how new releases are made, but if there is anything I can help with, I am ready :) |
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Yeah, I'm planning one pretty soon. I want to get a release out then drop Python 3.6. |
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Hi @henryiii ! |
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When a command (other than the first) in a pipeline wrote more than 64k to the stderr, and the output was consumed with the iter_lines function, the whole pipeline stalled. Fixed by reading the output of all commands where either stdout or stderr was set to PIPE.
This is the same issue as described in
#548
Same problem still exists if command is executed with run(), but that code calls proc.communicate to read stderr/stdout and I do not know how to fix that.