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[ aws . elasticache ]

modify-replication-group-shard-configuration

Description

Performs horizontal scaling on a Redis (cluster mode enabled) cluster with no downtime. Requires Redis engine version 3.2.10 or newer. For information on upgrading your engine to a newer version, see Upgrading Engine Versions in the Amazon ElastiCache User Guide.

For more information on ElastiCache for Redis online horizontal scaling, see ElastiCache for Redis Horizontal Scaling

See also: AWS API Documentation

See 'aws help' for descriptions of global parameters.

Synopsis

  modify-replication-group-shard-configuration
--replication-group-id <value>
--node-group-count <value>
--apply-immediately | --no-apply-immediately
[--resharding-configuration <value>]
[--node-groups-to-remove <value>]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]

Options

--replication-group-id (string)

The name of the Redis (cluster mode enabled) cluster (replication group) on which the shards are to be configured.

--node-group-count (integer)

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

--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 .

Value: true

--resharding-configuration (list)

Specifies the preferred availability zones for each node group in the cluster. If the value of NodeGroupCount is greater than the current number of node groups (shards), you can use this parameter to specify the preferred availability zones of the cluster's shards. If you omit this parameter ElastiCache selects availability zones for you.

You can specify this parameter only if the value of NodeGroupCount is greater than the current number of node groups (shards).

Shorthand Syntax:

PreferredAvailabilityZones=string,string ...

JSON Syntax:

[
  {
    "PreferredAvailabilityZones": ["string", ...]
  }
  ...
]

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

If the value of NodeGroupCount is less than the current number of node groups (shards), NodeGroupsToRemove is a required list of node group ids to remove from the cluster.

Syntax:

"string" "string" ...

--cli-input-json (string) Performs service operation based on the JSON string provided. The JSON string follows the format provided by --generate-cli-skeleton. If other arguments are provided on the command line, the CLI values will override the JSON-provided values.

--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. 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.

Output

ReplicationGroup -> (structure)

Contains all of the attributes of a specific Redis replication group.

ReplicationGroupId -> (string)

The identifier for the replication group.

Description -> (string)

The user supplied description of the replication group.

Status -> (string)

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

PendingModifiedValues -> (structure)

A group of settings to be applied to the replication group, either immediately or during the next maintenance window.

PrimaryClusterId -> (string)

The primary cluster ID that is applied immediately (if --apply-immediately was specified), or during the next maintenance window.

AutomaticFailoverStatus -> (string)

Indicates the status of Multi-AZ with automatic failover for this Redis replication group.

Amazon ElastiCache for Redis does not support Multi-AZ with automatic failover on:

  • Redis versions earlier than 2.8.6.
  • Redis (cluster mode disabled): T1 and T2 cache node types.
  • Redis (cluster mode enabled): T1 node types.

Resharding -> (structure)

The status of an online resharding operation.

SlotMigration -> (structure)

Represents the progress of an online resharding operation.

ProgressPercentage -> (double)

The percentage of the slot migration that is complete.

MemberClusters -> (list)

The identifiers of all the nodes that are part of this replication group.

(string)

NodeGroups -> (list)

A list of node groups in this replication group. For Redis (cluster mode disabled) replication groups, this is a single-element list. For Redis (cluster mode enabled) replication groups, the list contains an entry for each node group (shard).

(structure)

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

NodeGroupId -> (string)

The identifier for the node group (shard). A Redis (cluster mode disabled) replication group contains only 1 node group; therefore, the node group ID is 0001. A Redis (cluster mode enabled) replication group contains 1 to 15 node groups numbered 0001 to 0015.

Status -> (string)

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

PrimaryEndpoint -> (structure)

The endpoint of the primary node in this node group (shard).

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

Slots -> (string)

The keyspace for this node group (shard).

NodeGroupMembers -> (list)

A list containing information about individual nodes within the node group (shard).

(structure)

Represents a single node within a node group (shard).

CacheClusterId -> (string)

The ID of the cluster to which the node belongs.

CacheNodeId -> (string)

The ID of the node within its cluster. A node ID is a numeric identifier (0001, 0002, etc.).

ReadEndpoint -> (structure)

Represents the information required for client programs to connect to a cache node.

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

PreferredAvailabilityZone -> (string)

The name of the Availability Zone in which the node is located.

CurrentRole -> (string)

The role that is currently assigned to the node - primary or replica .

SnapshottingClusterId -> (string)

The cluster ID that is used as the daily snapshot source for the replication group.

AutomaticFailover -> (string)

Indicates the status of Multi-AZ with automatic failover for this Redis replication group.

Amazon ElastiCache for Redis does not support Multi-AZ with automatic failover on:

  • Redis versions earlier than 2.8.6.
  • Redis (cluster mode disabled): T1 and T2 cache node types.
  • Redis (cluster mode enabled): T1 node types.

ConfigurationEndpoint -> (structure)

The configuration endpoint for this replication group. Use the configuration endpoint to connect to this replication group.

Address -> (string)

The DNS hostname of the cache node.

Port -> (integer)

The port number that the cache engine is listening on.

SnapshotRetentionLimit -> (integer)

The number of days for which ElastiCache retains automatic cluster 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.

Warning

If the value of SnapshotRetentionLimit is set to zero (0), backups are turned off.

SnapshotWindow -> (string)

The daily time range (in UTC) during which ElastiCache begins taking a daily snapshot of your node group (shard).

Example: 05:00-09:00

If you do not specify this parameter, ElastiCache automatically chooses an appropriate time range.

Note

This parameter is only valid if the Engine parameter is redis .

ClusterEnabled -> (boolean)

A flag indicating whether or not this replication group is cluster enabled; i.e., whether its data can be partitioned across multiple shards (API/CLI: node groups).

Valid values: true | false

CacheNodeType -> (string)

The name of the compute and memory capacity node type for each node in the replication 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.

Default: false

AtRestEncryptionEnabled -> (boolean)

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

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

Default: false