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OdedEngel mannequin opened this issue Dec 31, 2018 · 4 comments
Open

Shelve sync issues while using Gevent #79805

OdedEngel mannequin opened this issue Dec 31, 2018 · 4 comments
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@OdedEngel
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OdedEngel mannequin commented Dec 31, 2018 •
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BPO 35624
Nosy @rhettinger, @terryjreedy, @vstinner, @remilapeyre

Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2018-12-31.08:12:16.504>
labels = ['3.8', 'type-bug', 'library']
title = 'Shelve sync issues while using Gevent'
updated_at = <Date 2019-01-07.15:16:09.720>
user = 'https://bugs.python.org/OdedEngel'

bugs.python.org fields:

activity = <Date 2019-01-07.15:16:09.720>
actor = 'vstinner'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2018-12-31.08:12:16.504>
creator = 'Oded Engel'
dependencies = []
files = []
hgrepos = []
issue_num = 35624
keywords = []
message_count = 4.0
messages = ['332807', '332809', '332994', '333038']
nosy_count = 5.0
nosy_names = ['rhettinger', 'terry.reedy', 'vstinner', 'remi.lapeyre', 'Oded Engel']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35624'
versions = ['Python 3.8']

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@OdedEngel
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OdedEngel mannequin commented Dec 31, 2018

Shelve method, sync, does not work when using gevent threading.
writeback was set to True, flag was set to 'c'.
only way to get the dbb synced is by closing and reopening the db.

@OdedEngel OdedEngel mannequin added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Dec 31, 2018
@remilapeyre
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remilapeyre mannequin commented Dec 31, 2018

Hi, thanks for opening a bug report. Can you provide a script that reproduce the issue?

@terryjreedy
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3.6 only gets security fixes. Please verify that there is a problem in 3.8 (or at least 3.7)

Also demonstrate that issue is not with the 3rd party gevent module. Does gevent includes compiled non-python code? (I suspect it does, but don't know.) If so, your script should *not* import that extension. Or you should close this as '3rd party' and submit a report to the gevent authors, who should be better able to determine where the problem originates.

@terryjreedy terryjreedy added the 3.8 (EOL) end of life label Jan 4, 2019
@rhettinger
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The docs already note a restriction: "the shelve module does not support concurrent read/write access to shelved objects". We should further document that sync() is not thread-safe. When sync() is running, the *writeback* attribute is set to False and other threads will stop updating the cache.

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
@serhiy-storchaka serhiy-storchaka added the pending The issue will be closed if no feedback is provided label Jan 25, 2024
@picnixz picnixz added docs Documentation in the Doc dir and removed type-bug An unexpected behavior, bug, or error stdlib Python modules in the Lib dir 3.8 (EOL) end of life pending The issue will be closed if no feedback is provided labels Dec 2, 2024
@bedevere-app bedevere-app bot mentioned this issue Dec 2, 2024
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