RDS / Client / failover_global_cluster

failover_global_cluster

RDS.Client.failover_global_cluster(**kwargs)

Promotes the specified secondary DB cluster to be the primary DB cluster in the global database cluster to fail over or switch over a global database. Switchover operations were previously called “managed planned failovers.”

Note

Although this operation can be used either to fail over or to switch over a global database cluster, its intended use is for global database failover. To switch over a global database cluster, we recommend that you use the SwitchoverGlobalCluster operation instead.

How you use this operation depends on whether you are failing over or switching over your global database cluster:

• Failing over - Specify the AllowDataLoss parameter and don’t specify the Switchover parameter.

• Switching over - Specify the Switchover parameter or omit it, but don’t specify the AllowDataLoss parameter.

About failing over and switching over

While failing over and switching over a global database cluster both change the primary DB cluster, you use these operations for different reasons:

• Failing over - Use this operation to respond to an unplanned event, such as a Regional disaster in the primary Region. Failing over can result in a loss of write transaction data that wasn’t replicated to the chosen secondary before the failover event occurred. However, the recovery process that promotes a DB instance on the chosen seconday DB cluster to be the primary writer DB instance guarantees that the data is in a transactionally consistent state. For more information about failing over an Amazon Aurora global database, see Performing managed failovers for Aurora global databases in the Amazon Aurora User Guide.

• Switching over - Use this operation on a healthy global database cluster for planned events, such as Regional rotation or to fail back to the original primary DB cluster after a failover operation. With this operation, there is no data loss. For more information about switching over an Amazon Aurora global database, see Performing switchovers for Aurora global databases in the Amazon Aurora User Guide.

See also: AWS API Documentation

Request Syntax

response = client.failover_global_cluster(
    GlobalClusterIdentifier='string',
    TargetDbClusterIdentifier='string',
    AllowDataLoss=True|False,
    Switchover=True|False
)

Parameters:

• GlobalClusterIdentifier (string) –

  [REQUIRED]

  The identifier of the global database cluster (Aurora global database) this operation should apply to. The identifier is the unique key assigned by the user when the Aurora global database is created. In other words, it’s the name of the Aurora global database.

  Constraints:

  • Must match the identifier of an existing global database cluster.

• TargetDbClusterIdentifier (string) –

  [REQUIRED]

  The identifier of the secondary Aurora DB cluster that you want to promote to the primary for the global database cluster. Use the Amazon Resource Name (ARN) for the identifier so that Aurora can locate the cluster in its Amazon Web Services Region.

• AllowDataLoss (boolean) –

  Specifies whether to allow data loss for this global database cluster operation. Allowing data loss triggers a global failover operation.

  If you don’t specify AllowDataLoss, the global database cluster operation defaults to a switchover.

  Constraints:

  • Can’t be specified together with the Switchover parameter.

• Switchover (boolean) –

  Specifies whether to switch over this global database cluster.

  Constraints:

  • Can’t be specified together with the AllowDataLoss parameter.

Return type:

dict

Returns:

Response Syntax

{
    'GlobalCluster': {
        'GlobalClusterIdentifier': 'string',
        'GlobalClusterResourceId': 'string',
        'GlobalClusterArn': 'string',
        'Status': 'string',
        'Engine': 'string',
        'EngineVersion': 'string',
        'DatabaseName': 'string',
        'StorageEncrypted': True|False,
        'DeletionProtection': True|False,
        'GlobalClusterMembers': [
            {
                'DBClusterArn': 'string',
                'Readers': [
                    'string',
                ],
                'IsWriter': True|False,
                'GlobalWriteForwardingStatus': 'enabled'|'disabled'|'enabling'|'disabling'|'unknown',
                'SynchronizationStatus': 'connected'|'pending-resync'
            },
        ],
        'FailoverState': {
            'Status': 'pending'|'failing-over'|'cancelling',
            'FromDbClusterArn': 'string',
            'ToDbClusterArn': 'string',
            'IsDataLossAllowed': True|False
        }
    }
}

Response Structure

• (dict) –

  • GlobalCluster (dict) –

    A data type representing an Aurora global database.

    • GlobalClusterIdentifier (string) –

      Contains a user-supplied global database cluster identifier. This identifier is the unique key that identifies a global database cluster.

    • GlobalClusterResourceId (string) –

      The Amazon Web Services Region-unique, immutable identifier for the global database cluster. This identifier is found in Amazon Web Services CloudTrail log entries whenever the Amazon Web Services KMS key for the DB cluster is accessed.

    • GlobalClusterArn (string) –

      The Amazon Resource Name (ARN) for the global database cluster.

    • Status (string) –

      Specifies the current state of this global database cluster.

    • Engine (string) –

      The Aurora database engine used by the global database cluster.

    • EngineVersion (string) –

      Indicates the database engine version.

    • DatabaseName (string) –

      The default database name within the new global database cluster.

    • StorageEncrypted (boolean) –

      The storage encryption setting for the global database cluster.

    • DeletionProtection (boolean) –

      The deletion protection setting for the new global database cluster.

    • GlobalClusterMembers (list) –

      The list of primary and secondary clusters within the global database cluster.

      • (dict) –

        A data structure with information about any primary and secondary clusters associated with a global cluster (Aurora global database).

        • DBClusterArn (string) –

          The Amazon Resource Name (ARN) for each Aurora DB cluster in the global cluster.

        • Readers (list) –

          The Amazon Resource Name (ARN) for each read-only secondary cluster associated with the global cluster.

          • (string) –

        • IsWriter (boolean) –

          Specifies whether the Aurora DB cluster is the primary cluster (that is, has read-write capability) for the global cluster with which it is associated.

        • GlobalWriteForwardingStatus (string) –

          Specifies whether a secondary cluster in the global cluster has write forwarding enabled, not enabled, or is in the process of enabling it.

        • SynchronizationStatus (string) –

          The status of synchronization of each Aurora DB cluster in the global cluster.

    • FailoverState (dict) –

      A data object containing all properties for the current state of an in-process or pending switchover or failover process for this global cluster (Aurora global database). This object is empty unless the SwitchoverGlobalCluster or FailoverGlobalCluster operation was called on this global cluster.

      • Status (string) –

        The current status of the global cluster. Possible values are as follows:

        • pending – The service received a request to switch over or fail over the global cluster. The global cluster’s primary DB cluster and the specified secondary DB cluster are being verified before the operation starts.

        • failing-over – This status covers the range of Aurora internal operations that take place during the switchover or failover process, such as demoting the primary Aurora DB cluster, promoting the secondary Aurora DB cluster, and synchronizing replicas.

        • cancelling – The request to switch over or fail over the global cluster was cancelled and the primary Aurora DB cluster and the selected secondary Aurora DB cluster are returning to their previous states.

      • FromDbClusterArn (string) –

        The Amazon Resource Name (ARN) of the Aurora DB cluster that is currently being demoted, and which is associated with this state.

      • ToDbClusterArn (string) –

        The Amazon Resource Name (ARN) of the Aurora DB cluster that is currently being promoted, and which is associated with this state.

      • IsDataLossAllowed (boolean) –

        Indicates whether the operation is a global switchover or a global failover. If data loss is allowed, then the operation is a global failover. Otherwise, it’s a switchover.

Exceptions

• RDS.Client.exceptions.GlobalClusterNotFoundFault

• RDS.Client.exceptions.InvalidGlobalClusterStateFault

• RDS.Client.exceptions.InvalidDBClusterStateFault

• RDS.Client.exceptions.DBClusterNotFoundFault