# NodeGroup
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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.

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

 ** NodeGroupId **   
The identifier for the node group (shard). A Valkey or Redis OSS (cluster mode disabled) replication group contains only 1 node group; therefore, the node group ID is 0001. A Valkey or Redis OSS (cluster mode enabled) replication group contains 1 to 90 node groups numbered 0001 to 0090. Optionally, the user can provide the id for a node group.   
Type: String  
Required: No

 ** NodeGroupMembers.NodeGroupMember.N **   
A list containing information about individual nodes within the node group (shard).  
Type: Array of [NodeGroupMember](API_NodeGroupMember.md) objects  
Required: No

 ** PrimaryEndpoint **   
The endpoint of the primary node in this node group (shard).  
Type: [Endpoint](API_Endpoint.md) object  
Required: No

 ** ReaderEndpoint **   
The endpoint of the replica nodes in this node group (shard). This value is read-only.  
Type: [Endpoint](API_Endpoint.md) object  
Required: No

 ** Slots **   
The keyspace for this node group (shard).  
Type: String  
Required: No

 ** Status **   
The current state of this replication group - `creating`, `available`, `modifying`, `deleting`.  
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/NodeGroup) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticache-2015-02-02/NodeGroup) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticache-2015-02-02/NodeGroup)