Package software.amazon.awscdk.services.neptune

@Stability(Experimental) package software.amazon.awscdk.services.neptune

Amazon Neptune Construct Library

---

cfn-resources: Stable

All classes with the Cfn prefix in this module (CFN Resources) are always stable and safe to use.

cdk-constructs: Experimental

The APIs of higher level constructs in this module are experimental and under active development. They are subject to non-backward compatible changes or removal in any future version. These are not subject to the Semantic Versioning model and breaking changes will be announced in the release notes. This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.

Amazon Neptune is a fast, reliable, fully managed graph database service that makes it easy to build and run applications that work with highly connected datasets. The core of Neptune is a purpose-built, high-performance graph database engine. This engine is optimized for storing billions of relationships and querying the graph with milliseconds latency. Neptune supports the popular graph query languages Apache TinkerPop Gremlin and W3C’s SPARQL, enabling you to build queries that efficiently navigate highly connected datasets.

The @aws-cdk/aws-neptune package contains primitives for setting up Neptune database clusters and instances. 

 import software.amazon.awscdk.services.neptune.*;

Starting a Neptune Database

To set up a Neptune database, define a DatabaseCluster. You must always launch a database in a VPC. 

 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "Database")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         .build();

By default only writer instance is provisioned with this construct.

Connecting

To control who can access the cluster, use the .connections attribute. Neptune databases have a default port, so you don't need to specify the port: 

 cluster.connections.allowDefaultPortFromAnyIpv4("Open to the world");

The endpoints to access your database cluster will be available as the .clusterEndpoint and .clusterReadEndpoint attributes: 

 String writeAddress = cluster.getClusterEndpoint().getSocketAddress();

IAM Authentication

You can also authenticate to a database cluster using AWS Identity and Access Management (IAM) database authentication; See https://docs.aws.amazon.com/neptune/latest/userguide/iam-auth.html for more information and a list of supported versions and limitations.

The following example shows enabling IAM authentication for a database cluster and granting connection access to an IAM role. 

 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "Cluster")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         .iamAuthentication(true)
         .build();
 Role role = Role.Builder.create(this, "DBRole").assumedBy(new AccountPrincipal(this.account)).build();
 cluster.grantConnect(role);

Customizing parameters

Neptune allows configuring database behavior by supplying custom parameter groups. For more details, refer to the following link: https://docs.aws.amazon.com/neptune/latest/userguide/parameters.html 

 ClusterParameterGroup clusterParams = ClusterParameterGroup.Builder.create(this, "ClusterParams")
         .description("Cluster parameter group")
         .parameters(Map.of(
                 "neptune_enable_audit_log", "1"))
         .build();
 
 ParameterGroup dbParams = ParameterGroup.Builder.create(this, "DbParams")
         .description("Db parameter group")
         .parameters(Map.of(
                 "neptune_query_timeout", "120000"))
         .build();
 
 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "Database")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         .clusterParameterGroup(clusterParams)
         .parameterGroup(dbParams)
         .build();

Adding replicas

DatabaseCluster allows launching replicas along with the writer instance. This can be specified using the instanceCount attribute. 

 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "Database")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         .instances(2)
         .build();

Additionally it is also possible to add replicas using DatabaseInstance for an existing cluster. 

 DatabaseInstance replica1 = DatabaseInstance.Builder.create(this, "Instance")
         .cluster(cluster)
         .instanceType(InstanceType.R5_LARGE)
         .build();

Automatic minor version upgrades

By setting autoMinorVersionUpgrade to true, Neptune will automatically update the engine of the entire cluster to the latest minor version after a stabilization window of 2 to 3 weeks. 

 DatabaseCluster.Builder.create(this, "Cluster")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         .autoMinorVersionUpgrade(true)
         .build();