decrease-node-groups-in-global-replication-group¶

Description¶

Decreases the number of node groups in a Global Datastore

Synopsis¶

  decrease-node-groups-in-global-replication-group
--global-replication-group-id <value>
--node-group-count <value>
[--global-node-groups-to-remove <value>]
[--global-node-groups-to-retain <value>]
--apply-immediately | --no-apply-immediately
[--cli-input-json | --cli-input-yaml]
[--generate-cli-skeleton <value>]

Options¶

--global-replication-group-id (string)

The name of the Global Datastore

--node-group-count (integer)

The number of node groups (shards) that results from the modification of the shard configuration

--global-node-groups-to-remove (list)

If the value of NodeGroupCount is less than the current number of node groups (shards), then either NodeGroupsToRemove or NodeGroupsToRetain is required. NodeGroupsToRemove is a list of NodeGroupIds to remove from the cluster. ElastiCache for Redis will attempt to remove all node groups listed by NodeGroupsToRemove from the cluster.

(string)

Syntax:

"string" "string" ...

--global-node-groups-to-retain (list)

If the value of NodeGroupCount is less than the current number of node groups (shards), then either NodeGroupsToRemove or NodeGroupsToRetain is required. NodeGroupsToRemove is a list of NodeGroupIds to remove from the cluster. ElastiCache for Redis will attempt to remove all node groups listed by NodeGroupsToRemove from the cluster.

(string)

Syntax:

"string" "string" ...

--apply-immediately | --no-apply-immediately (boolean)

Indicates that the shard reconfiguration process begins immediately. At present, the only permitted value for this parameter is true.

--cli-input-json | --cli-input-yaml (string) Reads arguments from the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, those values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally. This may not be specified along with --cli-input-yaml.

--generate-cli-skeleton (string) Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value input, prints a sample input JSON that can be used as an argument for --cli-input-json. Similarly, if provided yaml-input it will print a sample input YAML that can be used with --cli-input-yaml. If provided with the value output, it validates the command inputs and returns a sample output JSON for that command.

See ‘aws help’ for descriptions of global parameters.

Examples¶

To decrease the number of node groups in a global replication group

The following decrease-node-groups-in-global-replication-group decreases the node group count using the Redis engine.

aws elasticache decrease-node-groups-in-global-replication-group \
    --global-replication-group-id sgaui-test \
    --node-group-count 1 \
    --apply-immediately \
    --global-node-groups-to-retain sgaui-test-0003

Output:

{
    "GlobalReplicationGroup":
    {
        "GlobalReplicationGroupId": "sgaui-test",
        "GlobalReplicationGroupDescription": "test",
        "Status": "modifying",
        "CacheNodeType": "cache.r5.large",
        "Engine": "redis",
        "EngineVersion": "5.0.6",
        "Members": [
            {
                "ReplicationGroupId": "test-2",
                "ReplicationGroupRegion": "us-east-1",
                "Role": "SECONDARY",
                "AutomaticFailover": "enabled",
                "Status": "associated"
            },
            {
                "ReplicationGroupId": "test-1",
                "ReplicationGroupRegion": "us-west-2",
                "Role": "PRIMARY",
                "AutomaticFailover": "enabled",
                "Status": "associated"
            }
        ],
        "ClusterEnabled": true,
        "GlobalNodeGroups": [
            {
                "GlobalNodeGroupId": "sgaui-test-0001",
                "Slots": "0-449,1816-5461"
            },
            {
                "GlobalNodeGroupId": "sgaui-test-0002",
                "Slots": "6827-10922"
            },
            {
                "GlobalNodeGroupId": "sgaui-test-0003",
                "Slots": "10923-14052,15418-16383"
            },
            {
                "GlobalNodeGroupId": "sgaui-test-0004",
                "Slots": "450-1815,5462-6826,14053-15417"
            }
        ],
        "AuthTokenEnabled": false,
        "TransitEncryptionEnabled": false,
        "AtRestEncryptionEnabled": false
    }
}

For more information, see Replication Across AWS Regions Using Global Datastore in the Elasticache User Guide.

Output¶

GlobalReplicationGroup -> (structure)

Consists of a primary cluster that accepts writes and an associated secondary cluster that resides in a different AWS region. The secondary cluster accepts only reads. The primary cluster automatically replicates updates to the secondary cluster.

The GlobalReplicationGroupIdSuffix represents the name of the Global Datastore, which is what you use to associate a secondary cluster.

GlobalReplicationGroupId -> (string)

The name of the Global Datastore

GlobalReplicationGroupDescription -> (string)

The optional description of the Global Datastore

Status -> (string)

The status of the Global Datastore

CacheNodeType -> (string)

The cache node type of the Global Datastore

Engine -> (string)

The Elasticache engine. For Redis only.

EngineVersion -> (string)

The Elasticache Redis engine version.

Members -> (list)

The replication groups that comprise the Global Datastore.

(structure)

A member of a Global Datastore. It contains the Replication Group Id, the AWS region and the role of the replication group.

ReplicationGroupId -> (string)

The replication group id of the Global Datastore member.

ReplicationGroupRegion -> (string)

The AWS region of the Global Datastore member.

Role -> (string)

Indicates the role of the replication group, primary or secondary.

AutomaticFailover -> (string)

Indicates whether automatic failover is enabled for the replication group.

Status -> (string)

The status of the membership of the replication group.

ClusterEnabled -> (boolean)

A flag that indicates whether the Global Datastore is cluster enabled.

GlobalNodeGroups -> (list)

Indicates the slot configuration and global identifier for each slice group.

(structure)

Indicates the slot configuration and global identifier for a slice group.

GlobalNodeGroupId -> (string)

The name of the global node group

Slots -> (string)

The keyspace for this node group

AuthTokenEnabled -> (boolean)

A flag that enables using an AuthToken (password) when issuing Redis commands.

Default: false

TransitEncryptionEnabled -> (boolean)

A flag that enables in-transit encryption when set to true. You cannot modify the value of TransitEncryptionEnabled after the cluster is created. To enable in-transit encryption on a cluster you must set TransitEncryptionEnabled to true when you create a cluster.

Required: Only available when creating a replication group in an Amazon VPC using redis version 3.2.6 , 4.x or later.

AtRestEncryptionEnabled -> (boolean)

A flag that enables encryption at rest when set to true .

You cannot modify the value of AtRestEncryptionEnabled after the replication group is created. To enable encryption at rest on a replication group you must set AtRestEncryptionEnabled to true when you create the replication group.

Required: Only available when creating a replication group in an Amazon VPC using redis version 3.2.6 , 4.x or later.

ARN -> (string)

The ARN (Amazon Resource Name) of the global replication group.

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