Package software.amazon.awscdk.services.neptune.alpha

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

Amazon Neptune Construct Library

---

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 This means that while you may use them, you may need to update your source code when upgrading to a newer version of this package.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-alpha package contains primitives for setting up Neptune database clusters and instances. 

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

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();
 // Use one of the following statements to grant the role the necessary permissions
 cluster.grantConnect(role); // Grant the role neptune-db:* access to the DB
 cluster.grant(role, "neptune-db:ReadDataViaQuery", "neptune-db:WriteDataViaQuery");

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();

Note: To use the Neptune engine versions 1.2.0.0 or later, including the newly added 1.4 series, it's necessary to specify the appropriate engineVersion prop in neptune.DatabaseCluster. Additionally, for both 1.2, 1.3 and 1.4 series, the corresponding family prop must be set to ParameterGroupFamily.NEPTUNE_1_2, ParameterGroupFamily.NEPTUNE_1_3 or ParameterGroupFamily.NEPTUNE_1_4 respectively in neptune.ClusterParameterGroup and neptune.ParameterGroup.

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();

You can also specify autoMinorVersionUpgrade to a database instance. Even within the same cluster, you can modify the autoMinorVersionUpgrade setting on a per-instance basis. 

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

Port

By default, Neptune uses port 8182. You can override the default port by specifying the port property: 

 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "Database")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         .port(12345)
         .build();

Logging

Neptune supports various methods for monitoring performance and usage. One of those methods is logging

  1. Neptune provides logs e.g. audit logs which can be viewed or downloaded via the AWS Console. Audit logs can be enabled using the neptune_enable_audit_log parameter in ClusterParameterGroup or ParameterGroup
  2. Neptune provides the ability to export those logs to CloudWatch Logs

 // Cluster parameter group with the neptune_enable_audit_log param set to 1
 ClusterParameterGroup clusterParameterGroup = ClusterParameterGroup.Builder.create(this, "ClusterParams")
         .description("Cluster parameter group")
         .parameters(Map.of(
                 "neptune_enable_audit_log", "1"))
         .build();
 
 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "Database")
         .vpc(vpc)
         .instanceType(InstanceType.R5_LARGE)
         // Audit logs are enabled via the clusterParameterGroup
         .clusterParameterGroup(clusterParameterGroup)
         // Optionally configuring audit logs to be exported to CloudWatch Logs
         .cloudwatchLogsExports(List.of(LogType.AUDIT))
         // Optionally set a retention period on exported CloudWatch Logs
         .cloudwatchLogsRetention(RetentionDays.ONE_MONTH)
         .build();

For more information on monitoring, refer to https://docs.aws.amazon.com/neptune/latest/userguide/monitoring.html. For more information on audit logs, refer to https://docs.aws.amazon.com/neptune/latest/userguide/auditing.html. For more information on exporting logs to CloudWatch Logs, refer to https://docs.aws.amazon.com/neptune/latest/userguide/cloudwatch-logs.html.

Metrics

Both DatabaseCluster and DatabaseInstance provide a metric() method to help with cluster-level and instance-level monitoring. 

 DatabaseCluster cluster;
 DatabaseInstance instance;
 
 
 cluster.metric("SparqlRequestsPerSec"); // cluster-level SparqlErrors metric
 instance.metric("SparqlRequestsPerSec");

For more details on the available metrics, refer to https://docs.aws.amazon.com/neptune/latest/userguide/cw-metrics.html

Copy tags to snapshot

By setting copyTagsToSnapshot to true, all tags of the cluster are copied to the snapshots when they are created. 

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

Neptune Serverless

You can configure a Neptune Serverless cluster using the dedicated instance type along with the serverlessScalingConfiguration property.

Visit Using Amazon Neptune Serverless for more details. 

 DatabaseCluster cluster = DatabaseCluster.Builder.create(this, "ServerlessDatabase")
         .vpc(vpc)
         .instanceType(InstanceType.SERVERLESS)
         .serverlessScalingConfiguration(ServerlessScalingConfiguration.builder()
                 .minCapacity(1)
                 .maxCapacity(5)
                 .build())
         .build();