[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Yury Selivanov]

Yury Selivanov  added the comment:

Merged. Thank you, hope that you'll keep contributing! :)

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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed

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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Yury Selivanov]

Yury Selivanov  added the comment:


New changeset 6f16ffc1879fc934eba297b3e81bd940e32a7e03 by Yury Selivanov (Miss 
Islington (bot)) in branch '3.6':
[3.6] bpo-34263 Cap timeout submitted to epoll/select etc. to one day. 
(GH-8532) (GH-8587)
https://github.com/python/cpython/commit/6f16ffc1879fc934eba297b3e81bd940e32a7e03


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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Yury Selivanov]

Yury Selivanov  added the comment:


New changeset 172a81e42bc30da1bd4027db9cd3b6172469f7fe by Yury Selivanov (Miss 
Islington (bot)) in branch '3.7':
[3.7] bpo-34263 Cap timeout submitted to epoll/select etc. to one day. 
(GH-8532) (GH-8586)
https://github.com/python/cpython/commit/172a81e42bc30da1bd4027db9cd3b6172469f7fe


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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[miss-islington]

Change by miss-islington :


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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[miss-islington]

Change by miss-islington :


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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Yury Selivanov]

Yury Selivanov  added the comment:


New changeset 944451cd8d3e897138f4b43569de13cd081ee251 by Yury Selivanov 
(MartinAltmayer) in branch 'master':
bpo-34263 Cap timeout submitted to epoll/select etc. to one day. (GH-8532)
https://github.com/python/cpython/commit/944451cd8d3e897138f4b43569de13cd081ee251


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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[STINNER Victor]

STINNER Victor  added the comment:

For python 3.7, i suggest to fix the bug but don't remove the note from 3.7 
doc, dince 3.7.0 and older have the bug.

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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Martin Altmayer]

Martin Altmayer  added the comment:

Added a small PR. Shall we update the doc? With this PR there is no reason 
anymore to disallow timeouts greater than one day in asyncio.

Greetings from the sprints @ Edinburgh!

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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Martin Altmayer]

Change by Martin Altmayer :


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[issue34263] asyncio: "relative *delay* or absolute *when* should not exceed one day"

[Yury Selivanov]

New submission from Yury Selivanov :

asyncio documentation has this bit on timeouts:

Timeouts (relative *delay* or absolute *when*) should not exceed one day.

Victor told me that the actual reason for this recommendation is a limitation 
in epoll (or other OS/selector) that prevents us from waiting for events longer 
than a day or so.

The solution to this problem is simple: we need to cap the maximum time we pass 
to the "selector.select()" function (in base_events.py/_run_once) to one day.

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components: asyncio
messages: 322561
nosy: asvetlov, vstinner, yselivanov
priority: normal
severity: normal
status: open
title: asyncio: "relative *delay* or absolute *when* should not exceed one day"
versions: Python 3.7, Python 3.8

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