Fix transition exception when scaling Stopped k8s clusters #11598

bernardodemarco · 2025-09-08T17:28:28Z

Description

When scaling the compute offering of stopped k8s clusters, the following exception is thrown in the Management Server logs:

2025-09-08 16:53:27,031 INFO  [c.c.k.c.a.KubernetesClusterActionWorker] (API-Job-Executor-3:ctx-32fdc15a job-43 ctx-3bbdb451) (logid:0a5136ec) Scaling Kubernetes cluster : k8s-min-offering
2025-09-08 16:53:27,035 WARN  [c.c.k.c.a.KubernetesClusterActionWorker] (API-Job-Executor-3:ctx-32fdc15a job-43 ctx-3bbdb451) (logid:0a5136ec) Failed to transition state of the Kubernetes cluster : k8s-min-offering in state Stopped on event ScaleUpRequested
com.cloud.utils.fsm.NoTransitionException: Unable to transition to a new state from Stopped via ScaleUpRequested
	at com.cloud.utils.fsm.StateMachine2.getTransition(StateMachine2.java:108)
	at com.cloud.utils.fsm.StateMachine2.getNextState(StateMachine2.java:94)
	at com.cloud.utils.fsm.StateMachine2.transitTo(StateMachine2.java:124)
	at com.cloud.kubernetes.cluster.actionworkers.KubernetesClusterActionWorker.stateTransitTo(KubernetesClusterActionWorker.java:560)
	at com.cloud.kubernetes.cluster.actionworkers.KubernetesClusterScaleWorker.scaleKubernetesClusterOffering(KubernetesClusterScaleWorker.java:288)
	at com.cloud.kubernetes.cluster.actionworkers.KubernetesClusterScaleWorker.scaleCluster(KubernetesClusterScaleWorker.java:470)
	at com.cloud.kubernetes.cluster.KubernetesClusterManagerImpl.scaleKubernetesCluster(KubernetesClusterManagerImpl.java:1744)
# (...)

It is relevant to highlight that, although the exception is thrown, it does not interfere in the scaling process.

This PR proposes to fix the exception throw by adding a new state and transitions to the Kubernetes Cluster finite state machine.

Types of changes

Breaking change (fix or feature that would cause existing functionality to change)
New feature (non-breaking change which adds functionality)
Bug fix (non-breaking change which fixes an issue)
Enhancement (improves an existing feature and functionality)
Cleanup (Code refactoring and cleanup, that may add test cases)
build/CI
test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Bug Severity

Screenshots (if appropriate):

How Has This Been Tested?

Before upgrading the environment with the current PR's changes, I verified that when scaling the compute offering of stopped k8s clusters, the exception was thrown.

After applying the PR's changes, I verified that when scaling the compute offering of stopped k8s clusters, no exceptions were thrown.

bernardodemarco · 2025-09-08T17:30:12Z

@blueorangutan package

blueorangutan · 2025-09-08T17:32:04Z

@bernardodemarco a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

codecov · 2025-09-08T17:36:28Z

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 4.00%. Comparing base (9349b69) to head (6dd54e6).
⚠️ Report is 10 commits behind head on 4.20.

❗ There is a different number of reports uploaded between BASE (9349b69) and HEAD (6dd54e6). Click for more details.

HEAD has 1 upload less than BASE

Flag BASE (9349b69) HEAD (6dd54e6)

unittests 1 0

Additional details and impacted files

@@              Coverage Diff              @@
##               4.20   #11598       +/-   ##
=============================================
- Coverage     16.17%    4.00%   -12.17%     
=============================================
  Files          5656      402     -5254     
  Lines        498082    32642   -465440     
  Branches      60415     5799    -54616     
=============================================
- Hits          80569     1308    -79261     
+ Misses       408551    31183   -377368     
+ Partials       8962      151     -8811

Flag	Coverage Δ
uitests	`4.00% <ø> (-0.01%)`	⬇️
unittests	`?`

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

blueorangutan · 2025-09-08T18:44:30Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 14906

...rations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/KubernetesCluster.java

bernardodemarco · 2025-09-09T11:38:37Z

@blueorangutan package

blueorangutan · 2025-09-09T11:40:04Z

@bernardodemarco a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

blueorangutan · 2025-09-09T13:40:35Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 14919

weizhouapache · 2025-09-09T14:39:52Z

@blueorangutan test

blueorangutan · 2025-09-09T14:42:04Z

@weizhouapache a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

blueorangutan · 2025-09-10T06:17:49Z

[SF] Trillian test result (tid-14259)
Environment: kvm-ol8 (x2), zone: Advanced Networking with Mgmt server ol8
Total time taken: 52968 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr11598-t14259-kvm-ol8.zip
Smoke tests completed. 141 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

weizhouapache

code lgtm

I will test it

weizhouapache · 2025-09-10T12:01:24Z

tested ok @bernardodemarco

create CKS cluster
stop it
scale it with different offering: works
scale it with the same offering: works, but noticed an exception in log

2025-09-10 10:25:54,591 WARN  [c.c.k.c.a.KubernetesClusterScaleWorker] (API-Job-Executor-3:[ctx-4c667cd3, job-94, ctx-37993c65]) (logid:29bd2ac2) Failed to transition state of the Kubernetes cluster : cks-002 in state Stopped on event OperationSucceeded com.cloud.utils.fsm.NoTransitionException: Unable to transition to a new state from Stopped via OperationSucceeded

@bernardodemarco
I suggest to add a simple change as below

diff --git a/plugins/integrations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/actionworkers/KubernetesClusterScaleWorker.java b/plugins/integrations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/actionworkers/KubernetesClusterScaleWorker.java
index 6fb15088e9b..f6828e3b203 100644
--- a/plugins/integrations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/actionworkers/KubernetesClusterScaleWorker.java
+++ b/plugins/integrations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/actionworkers/KubernetesClusterScaleWorker.java
@@ -476,6 +476,8 @@ public class KubernetesClusterScaleWorker extends KubernetesClusterResourceModif
             scaleKubernetesClusterOffering();
         } else if (clusterSizeScalingNeeded) {
             scaleKubernetesClusterSize();
+        } else {
+            return true;
         }
         stateTransitTo(kubernetesCluster.getId(), KubernetesCluster.Event.OperationSucceeded);
         return true;

bernardodemarco · 2025-09-10T13:54:38Z

tested ok @bernardodemarco

@weizhouapache, thanks for testing!

I suggest to add a simple change as below

Yes, makes sense. I'll soon apply that. Thanks!

bernardodemarco · 2025-09-10T15:19:10Z

@weizhouapache, done! Verified now that when scaling a stopped k8s cluster to the same offering, no exception is thrown

bernardodemarco · 2025-09-10T15:19:18Z

@blueorangutan package

blueorangutan · 2025-09-10T15:20:04Z

@bernardodemarco a [SL] Jenkins job has been kicked to build packages. It will be bundled with KVM, XenServer and VMware SystemVM templates. I'll keep you posted as I make progress.

weizhouapache · 2025-09-10T15:27:36Z

@weizhouapache, done! Verified now that when scaling a stopped k8s cluster to the same offering, no exception is thrown

good, tested ok, thanks @bernardodemarco

blueorangutan · 2025-09-10T16:58:18Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 14939

weizhouapache · 2025-09-10T17:55:44Z

@blueorangutan test

blueorangutan · 2025-09-10T17:58:05Z

@weizhouapache a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

weizhouapache · 2025-09-11T08:42:23Z

tested ok

scale running cluster
scale stopped cluster to same offering
scale stopped cluster to another offering

weizhouapache · 2025-09-11T08:42:26Z

We had some issues with the testing environments.
Merging on approvals and manual test results. Will keep eye on smoke tests of the health check PR

blueorangutan · 2025-09-11T11:12:31Z

[SF] Trillian test result (tid-14283)
Environment: kvm-ol8 (x2), zone: Advanced Networking with Mgmt server ol8
Total time taken: 59010 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr11598-t14283-kvm-ol8.zip
Smoke tests completed. 141 look OK, 0 have errors, 0 did not run
Only failed and skipped tests results shown below:

Test	Result	Time (s)	Test File

…he#11598) * add new k8s cluster transition * apply suggestion * apply suggestion

add new k8s cluster transition

0cc25ed

bernardodemarco added this to the 4.20.2 milestone Sep 8, 2025

bernardodemarco requested review from Pearl1594 and nvazquez September 8, 2025 17:28

boring-cyborg bot added the component:kubernetes label Sep 8, 2025

Pearl1594 reviewed Sep 8, 2025

View reviewed changes

...rations/kubernetes-service/src/main/java/com/cloud/kubernetes/cluster/KubernetesCluster.java Outdated Show resolved Hide resolved

apply suggestion

97b7535

weizhouapache self-assigned this Sep 10, 2025

weizhouapache approved these changes Sep 10, 2025

View reviewed changes

apply suggestion

6dd54e6

weizhouapache merged commit 7c727a3 into apache:4.20 Sep 11, 2025
25 of 26 checks passed

dhslove pushed a commit to ablecloud-team/ablestack-cloud that referenced this pull request Sep 15, 2025

CKS: Fix transition exception when scaling Stopped k8s clusters (apac…

d4fa360

…he#11598) * add new k8s cluster transition * apply suggestion * apply suggestion

harikrishna-patnala mentioned this pull request Sep 17, 2025

Fix scaleKubernetesCluster API #11652

Merged

14 tasks

Fix transition exception when scaling Stopped k8s clusters #11598

Fix transition exception when scaling Stopped k8s clusters #11598

Uh oh!

Conversation

bernardodemarco commented Sep 8, 2025

Description

Types of changes

Feature/Enhancement Scale or Bug Severity

Bug Severity

Screenshots (if appropriate):

How Has This Been Tested?

Uh oh!

bernardodemarco commented Sep 8, 2025

Uh oh!

blueorangutan commented Sep 8, 2025

Uh oh!

codecov bot commented Sep 8, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

Uh oh!

Codecov Report

Uh oh!

blueorangutan commented Sep 8, 2025

Uh oh!

Uh oh!

bernardodemarco commented Sep 9, 2025

Uh oh!

blueorangutan commented Sep 9, 2025

Uh oh!

blueorangutan commented Sep 9, 2025

Uh oh!

weizhouapache commented Sep 9, 2025

Uh oh!

blueorangutan commented Sep 9, 2025

Uh oh!

blueorangutan commented Sep 10, 2025

Uh oh!

weizhouapache left a comment

Choose a reason for hiding this comment

Uh oh!

weizhouapache commented Sep 10, 2025

Uh oh!

bernardodemarco commented Sep 10, 2025

Uh oh!

bernardodemarco commented Sep 10, 2025

Uh oh!

bernardodemarco commented Sep 10, 2025

Uh oh!

blueorangutan commented Sep 10, 2025

Uh oh!

weizhouapache commented Sep 10, 2025

Uh oh!

blueorangutan commented Sep 10, 2025

Uh oh!

weizhouapache commented Sep 10, 2025

Uh oh!

blueorangutan commented Sep 10, 2025

Uh oh!

weizhouapache commented Sep 11, 2025

Uh oh!

weizhouapache commented Sep 11, 2025

Uh oh!

Uh oh!

blueorangutan commented Sep 11, 2025

Uh oh!

Reviewers

Assignees

Labels

Projects

Milestone

Development

Uh oh!

4 participants

codecov bot commented Sep 8, 2025 •

edited

Loading