MemoryDB / Client / failover_shard

failover_shard#

MemoryDB.Client.failover_shard(**kwargs)#

Used to failover a shard. This API is designed for testing the behavior of your application in case of MemoryDB failover. It is not designed to be used as a production-level tool for initiating a failover to overcome a problem you may have with the cluster. Moreover, in certain conditions such as large scale operational events, Amazon may block this API.

See also: AWS API Documentation

Request Syntax

response = client.failover_shard(
    ClusterName='string',
    ShardName='string'
)
Parameters:

  • ClusterName (string) –

    [REQUIRED]

    The cluster being failed over

  • ShardName (string) –

    [REQUIRED]

    The name of the shard

Return type:

dict

Returns:

Response Syntax

{
    'Cluster': {
        'Name': 'string',
        'Description': 'string',
        'Status': 'string',
        'PendingUpdates': {
            'Resharding': {
                'SlotMigration': {
                    'ProgressPercentage': 123.0
                }
            },
            'ACLs': {
                'ACLToApply': 'string'
            },
            'ServiceUpdates': [
                {
                    'ServiceUpdateName': 'string',
                    'Status': 'available'|'in-progress'|'complete'|'scheduled'
                },
            ]
        },
        'NumberOfShards': 123,
        'Shards': [
            {
                'Name': 'string',
                'Status': 'string',
                'Slots': 'string',
                'Nodes': [
                    {
                        'Name': 'string',
                        'Status': 'string',
                        'AvailabilityZone': 'string',
                        'CreateTime': datetime(2015, 1, 1),
                        'Endpoint': {
                            'Address': 'string',
                            'Port': 123
                        }
                    },
                ],
                'NumberOfNodes': 123
            },
        ],
        'AvailabilityMode': 'singleaz'|'multiaz',
        'ClusterEndpoint': {
            'Address': 'string',
            'Port': 123
        },
        'NodeType': 'string',
        'Engine': 'string',
        'EngineVersion': 'string',
        'EnginePatchVersion': 'string',
        'ParameterGroupName': 'string',
        'ParameterGroupStatus': 'string',
        'SecurityGroups': [
            {
                'SecurityGroupId': 'string',
                'Status': 'string'
            },
        ],
        'SubnetGroupName': 'string',
        'TLSEnabled': True|False,
        'KmsKeyId': 'string',
        'ARN': 'string',
        'SnsTopicArn': 'string',
        'SnsTopicStatus': 'string',
        'SnapshotRetentionLimit': 123,
        'MaintenanceWindow': 'string',
        'SnapshotWindow': 'string',
        'ACLName': 'string',
        'AutoMinorVersionUpgrade': True|False,
        'DataTiering': 'true'|'false'
    }
}

Response Structure

  • (dict) –

    • Cluster (dict) –

      The cluster being failed over

      • Name (string) –

        The user-supplied name of the cluster. This identifier is a unique key that identifies a cluster.

      • Description (string) –

        A description of the cluster

      • Status (string) –

        The status of the cluster. For example, Available, Updating, Creating.

      • PendingUpdates (dict) –

        A group of settings that are currently being applied.

        • Resharding (dict) –

          The status of an online resharding operation.

          • SlotMigration (dict) –

            The status of the online resharding slot migration

            • ProgressPercentage (float) –

              The percentage of the slot migration that is complete.

        • ACLs (dict) –

          A list of ACLs associated with the cluster that are being updated

          • ACLToApply (string) –

            A list of ACLs pending to be applied.

        • ServiceUpdates (list) –

          A list of service updates being applied to the cluster

          • (dict) –

            Update action that has yet to be processed for the corresponding apply/stop request

            • ServiceUpdateName (string) –

              The unique ID of the service update

            • Status (string) –

              The status of the service update

      • NumberOfShards (integer) –

        The number of shards in the cluster

      • Shards (list) –

        A list of shards that are members of the cluster.

        • (dict) –

          Represents a collection of nodes in a cluster. One node in the node group is the read/write primary node. All the other nodes are read-only Replica nodes.

          • Name (string) –

            The name of the shard

          • Status (string) –

            The current state of this replication group - creating, available, modifying, deleting.

          • Slots (string) –

            The keyspace for this shard.

          • Nodes (list) –

            A list containing information about individual nodes within the shard

            • (dict) –

              Represents an individual node within a cluster. Each node runs its own instance of the cluster’s protocol-compliant caching software.

              • Name (string) –

                The node identifier. A node name is a numeric identifier (0001, 0002, etc.). The combination of cluster name, shard name and node name uniquely identifies every node used in a customer’s Amazon account.

              • Status (string) –

                The status of the service update on the node

              • AvailabilityZone (string) –

                The Availability Zone in which the node resides

              • CreateTime (datetime) –

                The date and time when the node was created.

              • Endpoint (dict) –

                The hostname for connecting to this node.

                • Address (string) –

                  The DNS hostname of the node.

                • Port (integer) –

                  The port number that the engine is listening on.

          • NumberOfNodes (integer) –

            The number of nodes in the shard

      • AvailabilityMode (string) –

        Indicates if the cluster has a Multi-AZ configuration (multiaz) or not (singleaz).

      • ClusterEndpoint (dict) –

        The cluster’s configuration endpoint

        • Address (string) –

          The DNS hostname of the node.

        • Port (integer) –

          The port number that the engine is listening on.

      • NodeType (string) –

        The cluster’s node type

      • Engine (string) –

        The Redis OSS or Valkey engine used by the cluster.

      • EngineVersion (string) –

        The Redis engine version used by the cluster

      • EnginePatchVersion (string) –

        The engine patch version used by the cluster

      • ParameterGroupName (string) –

        The name of the parameter group used by the cluster

      • ParameterGroupStatus (string) –

        The status of the parameter group used by the cluster, for example ‘active’ or ‘applying’.

      • SecurityGroups (list) –

        A list of security groups used by the cluster

        • (dict) –

          Represents a single security group and its status.

          • SecurityGroupId (string) –

            The identifier of the security group.

          • Status (string) –

            The status of the security group membership. The status changes whenever a security group is modified, or when the security groups assigned to a cluster are modified.

      • SubnetGroupName (string) –

        The name of the subnet group used by the cluster

      • TLSEnabled (boolean) –

        A flag to indicate if In-transit encryption is enabled

      • KmsKeyId (string) –

        The ID of the KMS key used to encrypt the cluster

      • ARN (string) –

        The Amazon Resource Name (ARN) of the cluster.

      • SnsTopicArn (string) –

        The Amazon Resource Name (ARN) of the SNS notification topic

      • SnsTopicStatus (string) –

        The SNS topic must be in Active status to receive notifications

      • SnapshotRetentionLimit (integer) –

        The number of days for which MemoryDB retains automatic snapshots before deleting them. For example, if you set SnapshotRetentionLimit to 5, a snapshot that was taken today is retained for 5 days before being deleted.

      • MaintenanceWindow (string) –

        Specifies the weekly time range during which maintenance on the cluster is performed. It is specified as a range in the format ddd:hh24:mi-ddd:hh24:mi (24H Clock UTC). The minimum maintenance window is a 60 minute period.

      • SnapshotWindow (string) –

        The daily time range (in UTC) during which MemoryDB begins taking a daily snapshot of your shard. Example: 05:00-09:00 If you do not specify this parameter, MemoryDB automatically chooses an appropriate time range.

      • ACLName (string) –

        The name of the Access Control List associated with this cluster.

      • AutoMinorVersionUpgrade (boolean) –

        When set to true, the cluster will automatically receive minor engine version upgrades after launch.

      • DataTiering (string) –

        Enables data tiering. Data tiering is only supported for clusters using the r6gd node type. This parameter must be set when using r6gd nodes. For more information, see Data tiering.

Exceptions