Fix skip DRS for a VM by vishesh92 · Pull Request #12994 · apache/cloudstack

vishesh92 · 2026-04-10T06:45:58Z

Description

When a VM has skipFromDRS detail set, it is still not getting skipped. This PR fixes it.
Doc PR - apache/cloudstack-documentation#653

Details

This pull request refactors how the system determines whether a VM should be skipped for DRS (Distributed Resource Scheduler) operations. The main improvement is centralizing and simplifying the skip logic, now using the `UserVmDetailsDao` to check VM details in the database rather than relying solely on in-memory details. This ensures more accurate and consistent behavior.

Key changes:

Refactoring skip logic for DRS:

Introduced a new shouldSkipVMForDRS method to encapsulate all logic for determining if a VM should be skipped, making the code cleaner and easier to maintain.
Updated the main DRS processing loop to use the new shouldSkipVMForDRS method, ensuring consistent skip checks throughout the codebase.

Improved VM detail retrieval:

Now retrieves the SKIP_DRS flag using UserVmDetailsDao from the database, instead of only checking the VM's in-memory details map. This makes the skip logic more robust and reliable.

Dependency injection:

Added dependency injection for UserVmDetailsDao to enable database access for VM details.
Imported UserVmDetailVO and UserVmDetailsDao for use in the new logic.

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)

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Pull request overview

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Copilot was unable to run its full agentic suite in this review.

Fixes DRS skip behavior when the SKIP_DRS VM detail is set but not present in the in-memory VM details map by centralizing skip logic and consulting the DB-backed VM details DAO.

Changes:

Added DB-backed lookup of VmDetailConstants.SKIP_DRS via UserVmDetailsDao.
Centralized DRS skip logic into shouldSkipVMForDRS and reused it in both the main loop and skipDrs.

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codecov · 2026-04-10T07:12:28Z

Codecov Report

❌ Patch coverage is 40.90909% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 16.26%. Comparing base (c267ad3) to head (a3c3de5).

Files with missing lines	Patch %	Lines
...udstack/resourcedetail/ResourceDetailsDaoBase.java	0.00%	12 Missing ⚠️
...ache/cloudstack/cluster/ClusterDrsServiceImpl.java	90.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               4.20   #12994   +/-   ##
=========================================
  Coverage     16.26%   16.26%           
+ Complexity    13433    13430    -3     
=========================================
  Files          5665     5665           
  Lines        500572   500580    +8     
  Branches      60792    60785    -7     
=========================================
+ Hits          81417    81423    +6     
- Misses       410047   410051    +4     
+ Partials       9108     9106    -2

Flag	Coverage Δ
uitests	`4.15% <ø> (ø)`
unittests	`17.11% <40.90%> (+<0.01%)`	⬆️

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Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

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vishesh92 · 2026-04-10T08:06:09Z

@blueorangutan package

blueorangutan · 2026-04-10T08:08:04Z

@vishesh92 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 · 2026-04-10T09:01:57Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 17444

blueorangutan · 2026-04-10T09:37:44Z

[SF] Trillian Build Failed (tid-15852)

sureshanaparti · 2026-04-10T19:27:00Z

@blueorangutan test

blueorangutan · 2026-04-10T19:28:04Z

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

blueorangutan · 2026-04-11T11:09:00Z

[SF] Trillian test result (tid-15855)
Environment: kvm-ol8 (x2), zone: Advanced Networking with Mgmt server ol8
Total time taken: 53699 seconds
Marvin logs: https://github.com/blueorangutan/acs-prs/releases/download/trillian/pr12994-t15855-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

kiranchavala

@vishesh92

As discussed, if we could add a log message saying we are skipping a vm from drs plan when "generateClusterDrsPlan" api is called it will be beneficial to the admin user when troubleshooting.

Also, please update the doc about the "skipFromDRS" in vmsettings

https://docs.cloudstack.apache.org/en/4.22.0.0/adminguide/clusters.html#cloudstack-drs

…erviceImpl.java Co-authored-by: Suresh Kumar Anaparti <sureshkumar.anaparti@gmail.com>

vishesh92 · 2026-05-20T11:17:08Z

@vishesh92

As discussed, if we could add a log message saying we are skipping a vm from drs plan when "generateClusterDrsPlan" api is called it will be beneficial to the admin user when troubleshooting.

Also, please update the doc about the "skipFromDRS" in vmsettings

https://docs.cloudstack.apache.org/en/4.22.0.0/adminguide/clusters.html#cloudstack-drs

Created a doc PR here: apache/cloudstack-documentation#653

vishesh92 · 2026-05-20T11:17:21Z

@blueorangutan package

blueorangutan · 2026-05-20T11:18:04Z

@vishesh92 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 · 2026-05-20T12:22:38Z

Packaging result [SF]: ✔️ el8 ✔️ el9 ✔️ el10 ✔️ debian ✔️ suse15. SL-JID 17932

vishesh92 · 2026-05-20T12:31:36Z

@blueorangutan test

blueorangutan · 2026-05-20T12:32:04Z

@vishesh92 a [SL] Trillian-Jenkins test job (ol8 mgmt + kvm-ol8) has been kicked to run smoke tests

blueorangutan · 2026-05-20T13:45:45Z

[SF] Trillian Build Failed (tid-16120)

vishesh92 requested a review from Copilot April 10, 2026 06:46

sureshanaparti reviewed Apr 10, 2026

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Comment thread server/src/main/java/org/apache/cloudstack/cluster/ClusterDrsServiceImpl.java Outdated

apache deleted a comment from blueorangutan Apr 10, 2026

vishesh92 requested review from Copilot and removed request for Copilot April 10, 2026 06:52

Copilot AI reviewed Apr 10, 2026

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Comment thread server/src/main/java/org/apache/cloudstack/cluster/ClusterDrsServiceImpl.java Outdated

Comment thread server/src/main/java/org/apache/cloudstack/cluster/ClusterDrsServiceImpl.java

Comment thread server/src/main/java/org/apache/cloudstack/cluster/ClusterDrsServiceImpl.java Outdated

Copilot started reviewing on behalf of vishesh92 April 10, 2026 07:10 View session

Copilot started reviewing on behalf of vishesh92 April 10, 2026 07:13 View session

vishesh92 requested a review from Copilot April 10, 2026 07:31

Copilot started reviewing on behalf of vishesh92 April 10, 2026 07:32 View session

Copilot AI reviewed Apr 10, 2026

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Comment thread server/src/test/java/org/apache/cloudstack/cluster/ClusterDrsServiceImplTest.java

sureshanaparti reviewed Apr 13, 2026

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Comment thread server/src/main/java/org/apache/cloudstack/cluster/ClusterDrsServiceImpl.java

kiranchavala reviewed Apr 13, 2026

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weizhouapache added this to the 4.20.4 milestone May 7, 2026

vishesh92 and others added 3 commits May 20, 2026 16:01

Fix skip DRS for a VM

dd77380

Update server/src/main/java/org/apache/cloudstack/cluster/ClusterDrsS…

4ed3c12

…erviceImpl.java Co-authored-by: Suresh Kumar Anaparti <sureshkumar.anaparti@gmail.com>

Address comments & fix tests

a3c3de5

vishesh92 force-pushed the fix-skip-drs branch from 0a6803f to a3c3de5 Compare May 20, 2026 11:09

vishesh92 mentioned this pull request May 20, 2026

Document usage of skipFromDRS apache/cloudstack-documentation#653

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Description

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