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fixing race condition in worker shutdown #9738

Merged
merged 2 commits into from Dec 13, 2023
Merged

fixing race condition in worker shutdown #9738

merged 2 commits into from Dec 13, 2023

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brettsam
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@brettsam brettsam commented Dec 12, 2023 •
edited

Issue describing the changes in this PR

In the code here:

azure-functions-host/src/WebJobs.Script/Workers/Rpc/WebHostRpcWorkerChannelManager.cs

Lines 267 to 268 in 95a1a4b

if (_workerChannels.TryGetValue(language, out Dictionary<string, TaskCompletionSource<IRpcWorkerChannel>> rpcWorkerChannels)
&& rpcWorkerChannels.TryRemove(workerId, out TaskCompletionSource<IRpcWorkerChannel> value))

... the call to TryRemove() is not thread-safe as it's not on a ConcurrentDictionary. It's possible that multiple shutdown requests will flow through this code and eventually try to start up new workers. This can lead to an error message of Number of initialized language workers exceeded as we'd be creating more than we shut down.

This change switches to ConcurrentDictionary. The test that I've added only every failed while debugging... I was unable to get it to fail while running normally, but I'll leave it in as an extra check.

Pull request checklist

  • My changes do not require documentation changes
    • Otherwise: Documentation issue linked to PR
  • My changes should not be added to the release notes for the next release
    • Otherwise: I've added my notes to release_notes.md
  • My changes do not need to be backported to a previous version
    • Otherwise: Backport tracked by issue/PR #issue_or_pr
  • My changes do not require diagnostic events changes
    • Otherwise: I have added/updated all related diagnostic events and their documentation (Documentation issue linked to PR)
  • I have added all required tests (Unit tests, E2E tests)

Additional information

Additional PR information

@brettsam brettsam requested a review from a team as a code owner December 12, 2023 21:39
@brettsam brettsam changed the title adding test to check for a race (don't review...) adding test to check for a race Dec 12, 2023
@brettsam brettsam changed the title (don't review...) adding test to check for a race fixing race condition in worker shutdown Dec 12, 2023
@brettsam brettsam merged commit d3150b3 into dev Dec 13, 2023
9 checks passed
@brettsam brettsam deleted the brettsam/worker_shutdown_fix branch December 13, 2023 19:48
v-imohammad pushed a commit that referenced this pull request Dec 13, 2023
@brettsam @v-imohammad
fixing race condition in worker shutdown (#9738)
9289209
@fabiocav fabiocav mentioned this pull request Dec 13, 2023
Merged
8 tasks
v-imohammad added a commit that referenced this pull request Dec 13, 2023
@v-imohammad @mathewc @brettsam
Hotfix4.28.3 - remove condition exception/fixing race condition (#9742)
359eb50 
* Removing conditional exception handling from FileLogger (#9739)

* fixing race condition in worker shutdown (#9738)

* updating common prop

---------

Co-authored-by: Mathew Charles <mathewc@microsoft.com>
Co-authored-by: Brett Samblanet <brettsam@microsoft.com>
@brettsam brettsam mentioned this pull request Dec 14, 2023
Merged
8 tasks
brettsam added a commit that referenced this pull request Dec 14, 2023
@brettsam
Revert "fixing race condition in worker shutdown (#9738)"
2da108d 
This reverts commit d3150b3.
VpOfEngineering pushed a commit that referenced this pull request Dec 14, 2023
@brettsam
fixing race condition in worker shutdown (#9738)
1ebdf61
@VpOfEngineering VpOfEngineering mentioned this pull request Dec 14, 2023
Merged
8 tasks
v-imohammad pushed a commit that referenced this pull request Dec 14, 2023
@VpOfEngineering @mathewc @brettsam
Adding hotfix commits to 4.29.0 (#9745)
26ab1a1 
* Removing conditional exception handling from FileLogger (#9739)

* fixing race condition in worker shutdown (#9738)

---------

Co-authored-by: Mathew Charles <mathewc@microsoft.com>
Co-authored-by: Brett Samblanet <brettsam@microsoft.com>
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@liliankasem liliankasem liliankasem approved these changes

@soninaren soninaren soninaren approved these changes

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