[MDL-51111] MUC config.php random reset - Moodle Tracker

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Details

Type: Bug
Status: Closed
Priority: Minor
Resolution: Fixed
Affects Version/s: 2.8.5, 3.0, 3.9.2, 3.10.1
Fix Version/s: 3.9.5, 3.10.2
Component/s: Caching
Labels:
- CatalystIT
- ci
- partner
- triaged

Affected Branches:
MOODLE_28_STABLE, MOODLE_30_STABLE, MOODLE_310_STABLE, MOODLE_39_STABLE
Fixed Branches:
MOODLE_310_STABLE, MOODLE_39_STABLE
Pull from Repository:
https://github.com/brendanheywood/moodle
Pull 3.9 Branch:
~~MDL-51111~~-muc-reset-MOODLE_39_STABLE
Pull 3.9 Diff URL:
https://github.com/moodle/moodle/compare/MOODLE_39_STABLE...brendanheywood:MDL-51111-muc-reset-MOODLE_39_STABLE
Pull 3.11 Branch:
~~MDL-51111~~-muc-reset-MOODLE_311_STABLE
Pull 3.11 Diff URL:
https://github.com/moodle/moodle/compare/MOODLE_311_STABLE...brendanheywood:MDL-51111-muc-reset-MOODLE_311_STABLE
Pull Master Branch:
~~MDL-51111~~-muc-reset
Pull Master Diff URL:
https://github.com/moodle/moodle/compare/master...brendanheywood:MDL-51111-muc-reset
Testing Instructions:

Hide

1) Find the site data run

tail -F muc/config.php

2) As an anon user visit /admin/index.php?cache=0 or run

curl -I http://moodle.local/admin/index.php?cache=0

3) Confirm the tail above was empty, or if it did write (eg right after upgrade) then it was empty on subsequent runs

Show
1) Find the site data run tail -F muc/config.php 2) As an anon user visit /admin/index.php?cache=0 or run curl -I http://moodle.local/admin/index.php?cache=0 3) Confirm the tail above was empty, or if it did write (eg right after upgrade) then it was empty on subsequent runs

Description

Now and then the file-based MUC settings seems to be reset.

We have added an external memcached store and sometimes the config.php is reset to default settings. That means we have to reconfigure the memcached instance everytime and edit the store mappings when this happens.

This MUC config file resides in our NFS shared moodledata: /moodledata/moodle/muc/config.php

I have not yet figured out how to trigger this behaviour and currently it occurs randomly like once a week or once per two or three weeks. We have also had times when it occured more often.

There are also others experiencing this:
https://moodle.org/mod/forum/discuss.php?d=274344

Attachments

Issue Links

has a non-specific relationship to

MDL-57833 muc/config.php surprisingly, unnecessarily and non-deterministically overwritten

Closed

MDL-70233 alternative_cache_factory_class isn't honored when caching is disabled

Closed

MDL-41492 Allow alternate MUC cache config class (eg allow setup in pure $CFG / config.php)

Closed

MDLQA-15383 CLONE - Upgrade test using a big data set with many users

Passed

has been marked as being related by

MDL-70137 MUC config can become corrupt in certain cases

Closed

MDL-53256 Bad cache configuration file generated when file system flaky

Closed

MDL-51873 Get cache config even if is not writable

Closed

will help resolve

MDL-71166 REDIS configuration is lost after clearing muc

Closed

(2 has been marked as being related by, 1 will help resolve)

Activity

People

Assignee:: Brendan Heywood

Reporter:: Rikard E

Peer reviewer:: Peter Burnett

Integrator:: Victor Déniz Falcón

Tester:: Mathew May

Participants:: Andrew Lyons, Brendan Heywood, CiBoT, Cristina Gómez, David Mudrák (@mudrd8mz), Eloy Lafuente (stronk7), Eric Merrill, Eseosa, Jonathon Fowler, Matej Zerovnik, Mathew May, Matteo Scaramuccia, Peter Burnett, Rikard E, Rok Jaklič, Russell Smith, Victor Déniz Falcón

Component watchers:: Matteo Scaramuccia, David Woloszyn, Huong Nguyen, Jake Dallimore, Meirza, Michael Hawkins, Raquel Ortega, Safat Shahin, Stevani Andolo

Votes:: 23 Vote for this issue

Watchers:: 33 Start watching this issue

Dates

Created:: 14/Aug/15 3:46 AM

Updated:: 26/Oct/21 3:42 PM

Resolved:: 26/Feb/21 2:16 PM

Fix Release Date:: 8/Mar/21

Time Tracking

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Remaining:

Logged:

4h 45m