OCPBUGS-69394: improve conflict error handling in hosted cluster status updates

[jparrill]

Summary

This PR improves conflict error handling in the HostedCluster controller by properly handling API resource version conflicts during status updates.

This is part of the resolution of OCPBUGS-69394, still need more info about the behavior after this PR on Integration. The reasoning behind this is:

• The Schedule object triggers an OADP backup
• The backup triggers the pause
• HO tries to set the status of other changes meanwhile this Pause is triggered also
• The controllers tries to update the HC ending on multiples conflicts and triggering the rate limiter multiple times
• It ends on a long wait until the Pause is propagated to the HCP.

This PR solves the status changes from HO to ensure the error handling is well managed.

Problem

The HostedCluster controller was experiencing reconciliation failures when concurrent status updates occurred, leading to resource version conflicts. These conflicts were being treated as hard errors rather than temporary conditions that should trigger requeue.

Solution

• Add IsConflict() checks for all Status().Update() calls in the hosted cluster controller
• Return appropriate requeue results when conflicts occur instead of propagating errors
• Maintain proper error handling for non-conflict status update failures

Changes

• File: hypershift-operator/controllers/hostedcluster/hostedcluster_controller.go
• Type: Bug fix for status update conflict handling
• Impact: Reduces controller reconciliation errors due to concurrent status updates

Testing

• Changes follow existing error handling patterns
• Conflict scenarios now return requeue instead of error
• Non-conflict errors are still properly propagated

Fixes

• OCPBUGS-69394

Related Issues

• Addresses status update conflicts in hosted cluster controller reconciliation
• Improves controller stability under concurrent operations

🤖 Generated with Claude Code

[openshift-ci-robot]

@jparrill: This pull request references Jira Issue OCPBUGS-69394, which is invalid:

• expected the bug to target the "4.22.0" version, but no target version was set

Comment /jira refresh to re-evaluate validity if changes to the Jira bug are made, or edit the title of this pull request to link to a different bug.

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

Summary

This PR improves conflict error handling in the HostedCluster controller by properly handling API resource version conflicts during status updates.

Problem

The HostedCluster controller was experiencing reconciliation failures when concurrent status updates occurred, leading to resource version conflicts. These conflicts were being treated as hard errors rather than temporary conditions that should trigger requeue.

Solution

• Add IsConflict() checks for all Status().Update() calls in the hosted cluster controller
• Return appropriate requeue results when conflicts occur instead of propagating errors
• Maintain proper error handling for non-conflict status update failures

Changes

• File: hypershift-operator/controllers/hostedcluster/hostedcluster_controller.go
• Type: Bug fix for status update conflict handling
• Impact: Reduces controller reconciliation errors due to concurrent status updates

Testing

• Changes follow existing error handling patterns
• Conflict scenarios now return requeue instead of error
• Non-conflict errors are still properly propagated

Fixes

• OCPBUGS-69394

Related Issues

• Addresses status update conflicts in hosted cluster controller reconciliation
• Improves controller stability under concurrent operations

🤖 Generated with Claude Code

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[coderabbitai]

Walkthrough

Modified the hosted cluster controller to implement robust conflict handling across multiple reconciliation paths. When Kubernetes API updates encounter conflicts due to optimistic concurrency, the controller now requeues operations instead of failing, replacing direct error returns with requeue responses throughout status updates and finalizer removal operations.

Changes

Cohort / File(s)	Summary
Conflict-aware reconciliation logic hypershift-operator/controllers/hostedcluster/hostedcluster_controller.go	Added conflict-aware error handling to multiple reconciliation paths. Status updates, platform state persistence, and finalizer removals now requeue on conflicts rather than propagate errors. Modified defaultClusterIDsIfNeeded to return nil on conflicts, allowing automatic requeue.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

• Verify that all r.Client.Status().Update() and r.Update() calls properly handle conflicts by returning ctrl.Result{Requeue: true}
• Ensure defaultClusterIDsIfNeeded conflict handling consistently returns nil without suppressing other error types
• Validate that the requeue pattern is applied uniformly across AWS/Azure platform state persistence and finalizer removal branches
• Confirm no legitimate errors are inadvertently masked by overly broad conflict handling

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📥 Commits

Reviewing files that changed from the base of the PR and between ff985bc and 6e4048f.

📒 Files selected for processing (1)

• hypershift-operator/controllers/hostedcluster/hostedcluster_controller.go (15 hunks)

🧰 Additional context used

📓 Path-based instructions (1)

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-Focus on major issues impacting performance, readability, maintainability and security. Avoid nitpicks and avoid verbosity.

Files:

• hypershift-operator/controllers/hostedcluster/hostedcluster_controller.go

🔇 Additional comments (5)

hypershift-operator/controllers/hostedcluster/hostedcluster_controller.go (5)

373-378: LGTM! Proper conflict handling for status updates.

The implementation correctly distinguishes between transient conflicts (which trigger requeue) and genuine errors (which are aggregated and propagated). This pattern prevents reconciliation failures from resource version conflicts during concurrent status updates.

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424-426: LGTM! Consistent conflict handling across all status updates.

Excellent consistency in applying the conflict handling pattern across all status update operations including:

• AWS identity provider validation
• Security group deletion states
• Cloud resource destruction
• Grace period handling
• Platform credentials status
• Backup restoration status
• OIDC configuration

This comprehensive approach ensures the controller handles concurrent operations gracefully throughout the reconciliation lifecycle.

Also applies to: 454-456, 523-525, 598-600, 1372-1374, 1388-1390, 1438-1440, 2031-2033, 2046-2048

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618-620: LGTM! Appropriate conflict handling for finalizer removal.

Correctly applies conflict handling to the finalizer removal operation. Since finalizer updates modify the object spec, they can encounter resource version conflicts and benefit from the requeue pattern.

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1793-1795: LGTM! Conflict handling extends appropriately to resource reconciliation.

Good practice extending conflict handling to createOrUpdate operations for CAPI cluster and Azure SecretProviderClass resources. The createOrUpdate wrapper uses controller-runtime's CreateOrUpdate which can return conflicts during updates, so this handling improves stability during concurrent resource modifications.

Also applies to: 2059-2061, 2071-2073

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4453-4455: LGTM! Correct conflict handling for error-returning helper function.

The pattern here differs appropriately from status update handlers:

• defaultClusterIDsIfNeeded returns error type, not ctrl.Result
• Returning nil on conflict is correct - it avoids treating transient conflicts as hard errors
• The comment accurately describes the behavior: conflicts indicate concurrent modifications that will trigger automatic reconciliation via watch events

This is the proper pattern for helper functions that cannot directly control reconciliation flow.

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