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AWS DynamoDB Sink Connector¶

The Kafka Connect DynamoDB Sink Connector is used to export messages from Apache Kafka® to AWS DynamoDB, allowing you to export your Kafka data into your DynamoDB key-value and document database.

The connector periodically polls data from Kafka and writes it to DynamoDB. The data from each Kafka topic is batched and sent to DynamoDB. Due to constraints from DynamoDB, each batch can only contain one change per Key and each failure in a batch must be handled before the next batch is processed to ensure the exactly once guarantees. When a table doesn’t exist, the DynamoDB Sink connector creates the table dynamically depending on configuration and permissions.

Features¶

The DynamoDB connector offers a variety of features:

Exactly Once Delivery: The DynamoDB Sink Connector guarantees exactly once delivery using its internal retry policy on a per batch basis and DynamoDB’s natural deduplication of messages as long as ordering is guaranteed. However, this requires that the primary key used by the connector to be located on a single Kafka partition. Also, an override with the same data should not trigger a change in DynamoDB Streams.
Type Conversion: The connector dynamically converts basic types and complex structures into the equivalent DynamoDB types and structures.
Record Id: The connector allows the specification of a primary key based on the record’s Kafka fields. Look at the configurations options for more information.

Install the AWS DynamoDB Sink Connector¶

You can install this connector by using the Confluent Hub client (recommended) or you can manually download the ZIP file.

Install the connector using Confluent Hub¶

Prerequisite: Confluent Hub Client must be installed. This is installed by default with Confluent Enterprise.

Navigate to your Confluent Platform installation directory and run the following command to install the latest (latest) connector version. The connector must be installed on every machine where Connect will run.

confluent-hub install confluentinc/kafka-connect-aws-dynamodb:latest

You can install a specific version by replacing latest with a version number. For example:

confluent-hub install confluentinc/kafka-connect-aws-dynamodb:1.0.0-preview

Install the connector manually¶

Download and extract the ZIP file for your connector and then follow the manual connector installation instructions.

License¶

You can use this connector for a 30-day trial period without a license key.

After 30 days, this connector is available under a Confluent enterprise license. Confluent issues enterprise license keys to subscribers, along with providing enterprise-level support for Confluent Platform and your connectors. If you are a subscriber, please contact Confluent Support at support@confluent.io for more information.

See Confluent Platform license for license properties and License topic configuration for information about the license topic.

Configuration Properties¶

For a complete list of configuration properties for this connector, see AWS DynamoDB Sink Connector Configuration Properties.

Note

For an example of how to get Kafka Connect connected to Confluent Cloud, see Distributed Cluster in Connect Kafka Connect to Confluent Cloud.

Quick Start¶

This quick start uses the DynamoDB connector to export data produced by the Avro console producer to DynamoDB.

Before you begin, you must create the user or IAM role running the connector with write and create access to DynamoDB.

Install the connector through the Confluent Hub Client.
```
# run from your CP installation directory
confluent-hub install confluentinc/kafka-connect-aws-dynamodb:latest
```
Tip

By default, the plugin is installed in share/confluent-hub-components and added to the directory of the plugin path. If this is the first connector you have installed, you may need to restart the connect server for the plugin path change to take effect. See AWS DynamoDB CLI for details about setting up and using the CLI.
Start the services using the Confluent CLI.
```
confluent local start
```
Every service starts in order, printing a message with its status.
```
Starting zookeeper
zookeeper is [UP]
Starting kafka
kafka is [UP]
Starting schema-registry
schema-registry is [UP]
Starting kafka-rest
kafka-rest is [UP]
Starting connect
connect is [UP]
Starting ksql-server
ksql-server is [UP]
Starting control-center
control-center is [UP]
```
Note

You need to make sure the connector user has write access to DynamoDB and has deployed credentials appropriately. You can also pass additional properties to the credentials provider. For details, refer to AWS Credentials.

Start the Avro console producer to import a few records with a simple schema in Kafka. Use the following command:

  ./bin/kafka-avro-console-producer --broker-list localhost:9092 --topic dynamodb_topic \
--property value.schema='{"type":"record","name":"myrecord","fields":[{"name":"f1","type":"string"}]}'

Enter the following in the console producer:

{"f1": "value1"}
{"f1": "value2"}
{"f1": "value3"}
{"f1": "value4"}
{"f1": "value5"}
{"f1": "value6"}
{"f1": "value7"}
{"f1": "value8"}
{"f1": "value9"}

The records are published to the Kafka topic dynamodb_topic in Avro format.

Find the region that the DynamoDB instance is running in (for example, us-east-2) and create a config file with the following contents. Save it as quickstart-dynamodb.properties.

Note

In the following example, a DynamoDB table called dynamodb_topic will be created in your DynamoDB instance.

name=dynamodb-sink
connector.class=io.confluent.connect.aws.dynamodb.DynamoDbSinkConnector
tasks.max=1
topics=dynamodb_topic

# use the region to populate the next two properties
aws.dynamodb.region=<region>
aws.dynamodb.endpoint=https://dynamodb.<region>.amazonaws.com

confluent.topic.bootstrap.servers=localhost:9092
confluent.topic.replication.factor=1

Start the DynamoDB connector by loading its configuration with the following command:

Caution

You must include a double dash (--) between the topic name and your flag. For more information, see this post.

confluent local load dynamodb-sink -- -d quickstart-dynamodb.properties

{
   "name": "dynamodb-sink",
   "config": {
      "connector.class": "io.confluent.connect.aws.dynamodb.DynamoDbSinkConnector",
      "tasks.max": "1",
      "topics": "dynamodb_topic",
      "aws.dynamodb.region": "<region>",
      "aws.dynamodb.endpoint": "https://dynamodb.<region>.amazonaws.com",
      "confluent.topic.bootstrap.servers": "localhost:9092",
      "confluent.topic.replication.factor": "1",
      "name": "dynamodb-sink"
   },
   "tasks": [],
   "type": "sink"
}

Important

Don’t use the Confluent CLI commands in production environments.

Confirm that the connector is in a RUNNING state.
```
confluent local status dynamodb-sink
```

After the connector has ingested some records, use the AWS CLI to check that the data is available in DynamoDB.

aws dynamodb scan --table-name dynamodb_topic --region us-east-1

You should see nine items with keys:

{
    "Items": [
        {
            "partition": {
                "N": "0"
            },"offset": {
                "N": "0"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value1"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "1"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value2"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "2"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value3"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "3"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value4"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "4"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value5"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "5"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value6"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "6"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value7"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "7"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value8"
            }
        },{
            "partition": {
                "N": "0"
            },"offset": {
                "N": "8"
            },"name": {
                "S": "f1"
            },"type": {
                "S": "value9"
            }
        }
    ],
    "Count": 9,
    "ScannedCount": 9,
    "ConsumedCapacity": null
}

Enter the following command to stop the Connect worker and all services:

confluent local stop

Your output should resemble:

Stopping control-center
control-center is [DOWN]
Stopping ksql-server
ksql-server is [DOWN]
Stopping connect
connect is [DOWN]
Stopping kafka-rest
kafka-rest is [DOWN]
Stopping schema-registry
schema-registry is [DOWN]
Stopping kafka
kafka is [DOWN]
Stopping zookeeper
zookeeper is [DOWN]

Or, enter the following command to stop all services and delete all generated data:

confluent local destroy