Firehose

Amazon Kinesis Data Firehose Sink #

The Firehose sink writes to Amazon Kinesis Data Firehose.

Follow the instructions from the Amazon Kinesis Data Firehose Developer Guide to setup a Kinesis Data Firehose delivery stream.

To use the connector, add the following Maven dependency to your project:

<dependency>
    <groupId>org.apache.flink</groupId>
    <artifactId>flink-connector-aws-kinesis-firehose</artifactId>
    <version>1.15.0</version>
</dependency>

The KinesisFirehoseSink uses AWS v2 SDK for Java to write data from a Flink stream into a Firehose delivery stream.

Properties sinkProperties = new Properties();
// Required
sinkProperties.put(AWSConfigConstants.AWS_REGION, "eu-west-1");
// Optional, provide via alternative routes e.g. environment variables
sinkProperties.put(AWSConfigConstants.AWS_ACCESS_KEY_ID, "aws_access_key_id");
sinkProperties.put(AWSConfigConstants.AWS_SECRET_ACCESS_KEY, "aws_secret_access_key");

KinesisFirehoseSink<String> kdfSink =
    KinesisFirehoseSink.<String>builder()
        .setFirehoseClientProperties(sinkProperties)      // Required
        .setSerializationSchema(new SimpleStringSchema()) // Required
        .setDeliveryStreamName("your-stream-name")        // Required
        .setFailOnError(false)                            // Optional
        .setMaxBatchSize(500)                             // Optional
        .setMaxInFlightRequests(50)                       // Optional
        .setMaxBufferedRequests(10_000)                   // Optional
        .setMaxBatchSizeInBytes(4 * 1024 * 1024)          // Optional
        .setMaxTimeInBufferMS(5000)                       // Optional
        .setMaxRecordSizeInBytes(1000 * 1024)             // Optional
        .build();

flinkStream.sinkTo(kdfSink);
Properties sinkProperties = new Properties()
// Required
sinkProperties.put(AWSConfigConstants.AWS_REGION, "eu-west-1")
// Optional, provide via alternative routes e.g. environment variables
sinkProperties.put(AWSConfigConstants.AWS_ACCESS_KEY_ID, "aws_access_key_id")
sinkProperties.put(AWSConfigConstants.AWS_SECRET_ACCESS_KEY, "aws_secret_access_key")

val kdfSink =
    KinesisFirehoseSink.<String>builder()
        .setFirehoseClientProperties(sinkProperties)      // Required
        .setSerializationSchema(new SimpleStringSchema()) // Required
        .setDeliveryStreamName("your-stream-name")        // Required
        .setFailOnError(false)                            // Optional
        .setMaxBatchSize(500)                             // Optional
        .setMaxInFlightRequests(50)                       // Optional
        .setMaxBufferedRequests(10_000)                   // Optional
        .setMaxBatchSizeInBytes(4 * 1024 * 1024)          // Optional
        .setMaxTimeInBufferMS(5000)                       // Optional
        .setMaxRecordSizeInBytes(1000 * 1024)             // Optional
        .build()

flinkStream.sinkTo(kdfSink)

Configurations #

Flink’s Firehose sink is created by using the static builder KinesisFirehoseSink.<InputType>builder().

  1. setFirehoseClientProperties(Properties sinkProperties)
    • Required.
    • Supplies credentials, region and other parameters to the Firehose client.
  2. setSerializationSchema(SerializationSchema serializationSchema)
    • Required.
    • Supplies a serialization schema to the Sink. This schema is used to serialize elements before sending to Firehose.
  3. setDeliveryStreamName(String deliveryStreamName)
    • Required.
    • Name of the delivery stream to sink to.
  4. setFailOnError(boolean failOnError)
    • Optional. Default: false.
    • Whether failed requests to write records to Firehose are treated as fatal exceptions in the sink.
  5. setMaxBatchSize(int maxBatchSize)
    • Optional. Default: 500.
    • Maximum size of a batch to write to Firehose.
  6. setMaxInFlightRequests(int maxInFlightRequests)
    • Optional. Default: 50.
    • The maximum number of in flight requests allowed before the sink applies backpressure.
  7. setMaxBufferedRequests(int maxBufferedRequests)
    • Optional. Default: 10_000.
    • The maximum number of records that may be buffered in the sink before backpressure is applied.
  8. setMaxBatchSizeInBytes(int maxBatchSizeInBytes)
    • Optional. Default: 4 * 1024 * 1024.
    • The maximum size (in bytes) a batch may become. All batches sent will be smaller than or equal to this size.
  9. setMaxTimeInBufferMS(int maxTimeInBufferMS)
    • Optional. Default: 5000.
    • The maximum time a record may stay in the sink before being flushed.
  10. setMaxRecordSizeInBytes(int maxRecordSizeInBytes)
    • Optional. Default: 1000 * 1024.
    • The maximum record size that the sink will accept, records larger than this will be automatically rejected.
  11. build()
    • Constructs and returns the Firehose sink.

Using Custom Firehose Endpoints #

It is sometimes desirable to have Flink operate as a consumer or producer against a Firehose VPC endpoint or a non-AWS Firehose endpoint such as Localstack; this is especially useful when performing functional testing of a Flink application. The AWS endpoint that would normally be inferred by the AWS region set in the Flink configuration must be overridden via a configuration property.

To override the AWS endpoint, set the AWSConfigConstants.AWS_ENDPOINT and AWSConfigConstants.AWS_REGION properties. The region will be used to sign the endpoint URL.

Properties producerConfig = new Properties();
        producerConfig.put(AWSConfigConstants.AWS_REGION, "us-east-1");
        producerConfig.put(AWSConfigConstants.AWS_ACCESS_KEY_ID, "aws_access_key_id");
        producerConfig.put(AWSConfigConstants.AWS_SECRET_ACCESS_KEY, "aws_secret_access_key");
        producerConfig.put(AWSConfigConstants.AWS_ENDPOINT, "http://localhost:4566");
val producerConfig = new Properties()
producerConfig.put(AWSConfigConstants.AWS_REGION, "us-east-1")
producerConfig.put(AWSConfigConstants.AWS_ACCESS_KEY_ID, "aws_access_key_id")
producerConfig.put(AWSConfigConstants.AWS_SECRET_ACCESS_KEY, "aws_secret_access_key")
producerConfig.put(AWSConfigConstants.AWS_ENDPOINT, "http://localhost:4566")

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