Problem/Motivation

If two people save the same configuration entity at the same time we don't use locking to ensure that one is saved and the other is rejected.
#2430219: Implement a key value store to optimise config entity lookups opens a new avenue for race conditions since saving two different configuration entities could result in missing information in the lookup key value storage.

Steps to reproduce the locking problem:

  1. Install Drupal standard
  2. Open the main menu admin (admin/structure/menu/manage/main)
  3. Add a second menu item
  4. Open the main menu admin in a second tab
  5. Change the menu items order and save
  6. Come back to your first tab
  7. Change the menu name and save
  8. You've lost the menu items order set in the second tab

Steps to reproduce the key_value storage problem:

These steps, suggested by @alexpott, are supposed to help someone whiling to write a test that demonstrate that problem.

  1. Create a test entity with a lookup key and a 'foo' base field
  2. In the test entity save method add a sleep if the 'foo' base field contains the 'bar' value
  3. In two different processes, save two different entities of this type, the first with foo=bar and the second with foo=notbar
  4. See what happens

Proposed resolution

TBD

Remaining tasks

Discuss, demonstrate, fix.

User interface changes

None.

API changes

Maybe.

Comments

DuaelFr’s picture

DuaelFr
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Primary language French
Location Montpellier, France
CreditAttribution: DuaelFr as a volunteer and at Happyculture commented
Issue tags: +HappyDays1506
Dom.’s picture

Dom. CreditAttribution: Dom. commented

Can you add reproduction step on this ?

DuaelFr’s picture

DuaelFr
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Primary language French
Location Montpellier, France
CreditAttribution: DuaelFr as a volunteer and at Happyculture commented
Issue summary: View changes

Version: 8.0.x-dev » 8.1.x-dev

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catch’s picture

catch
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Primary language English
CreditAttribution: catch at Third and Grove commented
Title: Race conditions during configuration entity saves » Add concurrent editing protection to configuration entities
Category: Bug report » Task

Moving this to a task - it'd be nice to have but it's not really a bug. Lots of configuration changes via form submissions on a live site is quite rare these days given config import/export. We have some basic concurrent editing protection for content entities, so could start by looking at whether any of that logic is transferable.

dww’s picture

dww
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CreditAttribution: dww at TEN7 commented
Version: 8.9.x-dev » 9.3.x-dev
Issue tags: +Bug Smash Initiative

Tagging for bugsmash, since this started as a bug, and we triaged / discussed it in #bugsmash. Also moving the version.

Version: 9.3.x-dev » 9.4.x-dev

Drupal 9.3.0-rc1 was released on November 26, 2021, which means new developments and disruptive changes should now be targeted for the 9.4.x-dev branch. For more information see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.

Version: 9.4.x-dev » 9.5.x-dev

Drupal 9.4.0-alpha1 was released on May 6, 2022, which means new developments and disruptive changes should now be targeted for the 9.5.x-dev branch. For more information see the Drupal core minor version schedule and the Allowed changes during the Drupal core release cycle.

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