Parallel Cluster 3.14.1 & Python 3.14.2

[t-brown]

Required Info:

• AWS ParallelCluster version: 3.14.1
• Full cluster configuration without any credentials or personal data.
• Cluster name: foo
• Output of pcluster describe-cluster command. Unable to as the cluster did not start creating.
• [Optional] Arn of the cluster CloudFormation main stack: N/A

Bug description and how to reproduce:
When trying to create a new cluster with Parallel Cluster 3.14.1 and Python 3.14.2 I get the following error, with no cluster creation:

(.pc-3.14.1) tpbrown@localhost % pcluster create-cluster -n foo -c cluster_use_2c.yaml
{
  "message": "Invalid cluster configuration: There is no current event loop in thread 'MainThread'."
}

The cluster configuration file is:

Region: us-east-2
Imds:
  ImdsSupport: v2.0
Image:
  Os: alinux2023
Tags:
  - Key: Owner
    Value: tpbrown
  - Key: Purpose
    Value: Benchmarking
HeadNode:
  InstanceType: c7a.8xlarge
  Networking:
    SubnetId: subnet-XXXXXXXXXXX
    ElasticIp: true
  Ssh:
    KeyName: tpbrown
  Iam:
    AdditionalIamPolicies:
      - Policy: arn:aws:iam::aws:policy/AmazonSSMManagedInstanceCore
      - Policy: arn:aws:iam::aws:policy/AmazonS3FullAccess
      - Policy: arn:aws:iam::aws:policy/AmazonFSxFullAccess
      - Policy: arn:aws:iam::aws:policy/SecretsManagerReadWrite
    S3Access:
      - BucketName: '*'
        EnableWriteAccess: true
  LocalStorage:
    RootVolume:
      Size: 50
  Dcv:
    Enabled: true
    AllowedIps: 127.0.0.1/8

Scheduling:
  Scheduler: slurm
  SlurmQueues:
    - Name: p5
      ComputeResources:
        - Name: p5
          InstanceType: p5e.48xlarge
          MinCount: 1
          MaxCount: 1
          DisableSimultaneousMultithreading: true
          Efa:
            Enabled: true
      CapacityReservationTarget:
        CapacityReservationId: cr-XXXXXXXXXXX
      CapacityType: CAPACITY_BLOCK
      Networking:
        SubnetIds:
          - subnet-XXXXXXXXXX

SharedStorage:
  - Name: FsxLustre
    StorageType: FsxLustre
    MountDir: /fsx
    FsxLustreSettings:
      StorageCapacity: 9600
      DeploymentType: PERSISTENT_2
      PerUnitStorageThroughput: 1000
      DataCompressionType: LZ4
  - Name: FsxOpenZFSSoftware
    StorageType: FsxOpenZfs
    MountDir: /sw
    FsxOpenZfsSettings:
      VolumeId: fsvol-XXXXXXXXXXX
  - Name: FsxOpenZFSHomes
    StorageType: FsxOpenZfs
    MountDir: /home
    FsxOpenZfsSettings:
      VolumeId: fsvol-XXXXXXXXXXX

DirectoryService:
  DomainName: "dc=my-domain,dc=com"
  DomainAddr: ldap://1A.B.C.D
  PasswordSecretArn: arn:aws:secretsmanager:us-east-2:XXXXXXXXXXXX:secret:ldap_password 
DomainReadOnlyUser: "cn=read-only,dc=my-domain,dc=com"
  GenerateSshKeysForUsers: true
  AdditionalSssdConfigs:
    ldap_user_object_class: inetOrgPerson
    ldap_user_name: uid
    ldap_user_uid_number: uidNumber
    ldap_user_gid_number: gidNumber
    ldap_user_home_directory: homeDirectory
    ldap_user_shell: loginShell
    debug_level: "0x1ff"

[hgreebe]

Hello,
What Python version does your environment have installed? ParallelCluster 3.14.x supports Python 3.12. If you have a newer version of Python installed, downgrade it to Python 3.12 and try the cluster creation again.

ParallelCluster 3.15.0 will support Python 3.14. It is expected to be released by the end of the Month.

Thank you