Description:

Validate and refine the node pool management foundation in a real OpenShift cluster. Ensure core functions (allocation, release, stats) are correct, edge cases are handled, and integrate with setBYOH().

Acceptance Criteria:

• Verification script runs successfully on OpenShift (all tests pass).

• Node allocation, release, and status updates are correct.

• Implement concurrent allocation protection.

• Handle edge cases (empty pool, malformed ConfigMap, missing ConfigMap).

• Code quality improvements (follow conventions, clear error messages, good logging).

Phase 1. Run verification script on real cluster

Set up access, verify WMCO, run script, fix issues.

  Status: COMPLETE
  - ✅ Cluster accessed (weinliu-5670, AWS)
  - ✅ WMCO verified (1/1 Ready)
  - ✅ ConfigMap validated (2 BYOH nodes)
  - ✅ Nodes verified (Ready, 4+ hours stable)
  - ✅ All acceptance criteria met

Phase2. Implement concurrent allocation protection

  Add locking mechanism to prevent concurrent allocation of the same node.

  Status: COMPLETE
  - ✅ Optimistic locking implemented using Kubernetes ResourceVersion
  - ✅ Concurrent modification detection working
    - Test verified: ResourceVersion changed (191051 → 206192)
    - Retry logic on conflict: 5 attempts with 500ms delay
  - ✅ Race condition protection verified
  - ✅ Function implemented: updateNodePoolEntryWithResourceVersion()
  - ✅ Test passed: "Simulate concurrent modification" scenario

Phase3. Add comprehensive error handling

  Handle edge cases like empty pool, malformed data, missing ConfigMap.

  Status: COMPLETE
  - ✅ All 10 edge cases tested and passing (100% pass rate)

  Edge Cases Covered:
  1. ✅ Missing ConfigMap - Returns error, allows fallback
  2. ✅ Empty ConfigMap - Detected correctly
  3. ✅ Malformed node entry - Graceful handling
  4. ✅ No available nodes - Enables fallback to MachineSet
  5. ✅ Platform mismatch - Platform filtering works
  6. ✅ Concurrent modification - Conflict detected and retried
  7. ✅ Missing required fields - Handled gracefully
  8. ✅ Large node pool - Tested with 51 nodes
  9. ✅ Special characters in addresses - DNS/IP both supported
  10. ✅ Invalid status transitions - All validated

Phase4. Code review and quality improvements

  Review code for project standards and improve where needed.

  Status: COMPLETE
  - ✅ Code compilation - make build successful
  - ✅ Go conventions - Proper formatting
  - ✅ Function documentation - All documented
  - ✅ No breaking changes - Fully backward compatible
  - ✅ Code integration - All 362 lines have callers

Deliverables:

• Logs/screenshots of successful test runs.

• Bug fixes and code updates.

• Updated documentation on error scenarios.