[Bug]: Elasticache ReplicationGroup not adjusting replica count

[KhasDenis]

Is there an existing issue for this?

• I have searched the existing issues

Affected Resource(s)

• elasticache.aws.upbound.io/v1beta2 - ReplicationGroup

Resource MRs required to reproduce the bug

apiVersion: elasticache.aws.upbound.io/v1beta2
kind: ReplicationGroup
metadata:
  name: elasticcache-dkh
spec:
  deletionPolicy: Orphan
  forProvider:
    applyImmediately: true
    atRestEncryptionEnabled: true
    authTokenSecretRef:
      key: password
      name: elasticcache-dkh-secret
      namespace: default
    authTokenUpdateStrategy: ROTATE
    autoGenerateAuthToken: false
    autoMinorVersionUpgrade: "true"
    automaticFailoverEnabled: false
    description: elasticcache-dkh- Replication Group
    engine: redis
    engineVersion: "7.0"
    ipDiscovery: ipv4
    maintenanceWindow: sun:23:00-mon:00:00
    multiAzEnabled: false
    networkType: ipv4
    nodeType: cache.m5.large
    numCacheClusters: 2
    parameterGroupName: elasticcache-dkh
    port: 6379
    region: eu-central-1
    securityGroupIds:
    - sg-05cb53f9b298ee781
    snapshotWindow: 02:30-03:30
    subnetGroupName: nebula-npg-eks-ec-sub-nprd
    transitEncryptionEnabled: true
    transitEncryptionMode: required
  initProvider:
    authTokenUpdateStrategy: ROTATE
  managementPolicies:
  - '*'
  providerConfigRef:
    name: default
  writeConnectionSecretToRef:
    name: elasticcache-dkh-output
    namespace: default

Steps to Reproduce

• Apply manifest from above
• Wait till resource created
• Change numCacheClusters from 2 to 3

What happened?

If I apply provided manifest elasticache redis cluster is created successfully with cluster mode disabled and two nodes primary and replica. But if now I edit ReplicationGroup changing numCacheClusters from 2 to 3 additional node comes to create/delete loop in AWS. ReplicationGroup stays SYNCED and READY in the cluster.

Relevant Error Output Snippet

No response

Crossplane Version

1.16.0

Provider Version

1.9.0

Kubernetes Version

1.30

Kubernetes Distribution

EKS

Additional Info

No response

[turkenf]

Hi @KhasDenis,

Thank you for the issue report. Could you please provide us with the output of provider logs (if any diff is detected)?