kafka-connect-dynamodb is a Kafka Connector for loading data to and from Amazon DynamoDB.

It is implemented using the AWS Java SDK for DynamoDB. For authentication, the DefaultAWSCredentialsProviderChain is used.

Building

Run:

$ mvn clean package

Then you will find this connector and required JARs it depends upon in target/kafka-connect-dynamodb-$version-SNAPSHOT-package/share/java/kafka-connect-dynamodb/*.

To create an uber JAR:

$ mvn -P standalone clean package

The uber JAR will be created at target/kafka-connect-dynamodb-$version-SNAPSHOT-standalone.jar.

Sink Connector

Example configuration

Ingest the orders topic to a DynamoDB table of the same name in the specified region:

name=dynamodb-sink-test
topics=orders
connector.class=dynamok.sink.DynamoDbSinkConnector
region=us-west-2
ignore.record.key=true

Record conversion

Refer to DynamoDB Data Types.

At the top-level, we need to either be converting to the DynamoDB Map data type, or the top.key.attribute or top.value.attribute configuration options for the Kafka record key or value as applicable should be configured, so we can ensure being able to hoist the converted value as a DynamoDB record.

Schema present

Connect Schema Type	DynamoDB
INT8, INT16, INT32, INT64, FLOAT32, FLOAT64, Decimal	Number
BOOL	Boolean
BYTES	Binary
STRING	String
ARRAY	List
MAP1, STRUCT	Map

null values for optional schemas are translated to the Null type.

Schemaless

Java	DynamoDB
null	Null
Number2	Number
Boolean	Boolean
byte[], ByteBuffer	Binary
String	String
List	List
Empty Set3	Null
Set<String>	String Set
Set<Number>	Number Set
Set<byte[]>, Set<ByteBuffer>	Binary Set
Map4	Map

Any other datatype will result in the connector to fail.

Configuration options

region

AWS region for DynamoDB.

• Type: string
• Default: ""
• Importance: high

access.key.id

Explicit AWS access key ID. Leave empty to utilize the default credential provider chain.

• Type: password
• Default: [hidden]
• Importance: low

secret.key

Explicit AWS secret access key. Leave empty to utilize the default credential provider chain.

• Type: password
• Default: [hidden]
• Importance: low

batch.size

Batch size between 1 (dedicated PutItemRequest for each record) and 25 (which is the maximum number of items in a BatchWriteItemRequest)

• Type: int
• Default: 1
• Importance: high

kafka.attributes

Trio of topic,partition,offset attribute names to include in records, set to empty to omit these attributes.

• Type: list
• Default: [kafka_topic, kafka_partition, kafka_offset]
• Importance: high

table.format

Format string for destination DynamoDB table name, use ${topic} as placeholder for source topic.

• Type: string
• Default: "${topic}"
• Importance: high

ignore.record.key

Whether to ignore Kafka record keys in preparing the DynamoDB record.

• Type: boolean
• Default: false
• Importance: medium

ignore.record.value

Whether to ignore Kafka record value in preparing the DynamoDB record.

• Type: boolean
• Default: false
• Importance: medium

top.key.attribute

DynamoDB attribute name to use for the record key. Leave empty if no top-level envelope attribute is desired.

• Type: string
• Default: ""
• Importance: medium

top.value.attribute

DynamoDB attribute name to use for the record value. Leave empty if no top-level envelope attribute is desired.

• Type: string
• Default: ""
• Importance: medium

max.retries

The maximum number of times to retry on errors before failing the task.

• Type: int
• Default: 10
• Importance: medium

retry.backoff.ms

The time in milliseconds to wait following an error before a retry attempt is made.

• Type: int
• Default: 3000
• Importance: medium

Source Connector

Example configuration

Ingest all DynamoDB tables in the specified region, to Kafka topics with the same name as the source table:

name=dynamodb-source-test
connector.class=dynamok.source.DynamoDbSourceConnector
region=us-west-2

Record conversion

TODO describe conversion scheme

Limitations

DynamoDB records containing heterogeneous lists (L) or maps (M) are not currently supported, these fields will be silently dropped. It will be possible to add support for them with the implementation of KAFKA-3910.

Configuration options

region

AWS region for DynamoDB.

• Type: string
• Default: ""
• Importance: high

access.key.id

Explicit AWS access key ID. Leave empty to utilize the default credential provider chain.

• Type: password
• Default: [hidden]
• Importance: low

secret.key

Explicit AWS secret access key. Leave empty to utilize the default credential provider chain.

• Type: password
• Default: [hidden]
• Importance: low

topic.format

Format string for destination Kafka topic, use ${table} as placeholder for source table name.

• Type: string
• Default: "${table}"
• Importance: high

tables.prefix

Prefix for DynamoDB tables to source from.

• Type: string
• Default: ""
• Importance: medium

tables.whitelist

Whitelist for DynamoDB tables to source from.

• Type: list
• Default: ""
• Importance: medium

tables.blacklist

Blacklist for DynamoDB tables to source from.

• Type: list
• Default: ""
• Importance: medium

---

1. Map keys must be primitive types, and cannot be optional.↩

2. i.e. Byte, Short, Integer, Long, Float, Double, BigInteger, BigDecimal↩

3. It is not possible to determine the element type of an empty set.↩

4. Map keys must be primitive types, and cannot be optional.↩