# NodeGroupConfiguration
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Node group (shard) configuration options. Each node group (shard) configuration has the following: `Slots`, `PrimaryAvailabilityZone`, `ReplicaAvailabilityZones`, `ReplicaCount`.

## Contents
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**Note**  
In the following list, the required parameters are described first.

 ** NodeGroupId **   
Either the ElastiCache supplied 4-digit id or a user supplied id for the node group these configuration values apply to.  
Type: String  
Length Constraints: Minimum length of 1. Maximum length of 4.  
Pattern: `\d+`   
Required: No

 ** PrimaryAvailabilityZone **   
The Availability Zone where the primary node of this node group (shard) is launched.  
Type: String  
Required: No

 ** PrimaryOutpostArn **   
The outpost ARN of the primary node.  
Type: String  
Required: No

 ** ReplicaAvailabilityZones.AvailabilityZone.N **   
A list of Availability Zones to be used for the read replicas. The number of Availability Zones in this list must match the value of `ReplicaCount` or `ReplicasPerNodeGroup` if not specified.  
Type: Array of strings  
Required: No

 ** ReplicaCount **   
The number of read replica nodes in this node group (shard).  
Type: Integer  
Required: No

 ** ReplicaOutpostArns.OutpostArn.N **   
The outpost ARN of the node replicas.  
Type: Array of strings  
Required: No

 ** Slots **   
A string that specifies the keyspace for a particular node group. Keyspaces range from 0 to 16,383. The string is in the format `startkey-endkey`.  
Example: `"0-3999"`   
Type: String  
Required: No

## See Also
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For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/elasticache-2015-02-02/NodeGroupConfiguration) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticache-2015-02-02/NodeGroupConfiguration) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticache-2015-02-02/NodeGroupConfiguration)