Chapter 24. AWS Kinesis Component

Available as of Camel version 2.17

The Kinesis component supports receiving messages from and sending messages to Amazon Kinesis service.

Prerequisites

You must have a valid Amazon Web Services developer account, and be signed up to use Amazon Kinesis. More information are available at AWS Kinesis

24.1. URI Format

aws-kinesis://stream-name[?options]

The stream needs to be created prior to it being used.
You can append query options to the URI in the following format, ?options=value&option2=value&…​

24.2. URI Options

The AWS Kinesis component supports 5 options which are listed below.

NameDescriptionDefaultType

configuration (advanced)

The AWS S3 default configuration

 

KinesisConfiguration

accessKey (common)

Amazon AWS Access Key

 

String

secretKey (common)

Amazon AWS Secret Key

 

String

region (common)

Amazon AWS Region

 

String

resolveProperty Placeholders (advanced)

Whether the component should resolve property placeholders on itself when starting. Only properties which are of String type can use property placeholders.

true

boolean

The AWS Kinesis endpoint is configured using URI syntax:

aws-kinesis:streamName

with the following path and query parameters:

24.2.1. Path Parameters (1 parameters):

NameDescriptionDefaultType

streamName

Required Name of the stream

 

String

24.2.2. Query Parameters (30 parameters):

NameDescriptionDefaultType

amazonKinesisClient (common)

Amazon Kinesis client to use for all requests for this endpoint

 

AmazonKinesis

proxyHost (common)

To define a proxy host when instantiating the DDBStreams client

 

String

proxyPort (common)

To define a proxy port when instantiating the DDBStreams client

 

Integer

region (common)

The region in which Kinesis client needs to work

 

String

bridgeErrorHandler (consumer)

Allows for bridging the consumer to the Camel routing Error Handler, which mean any exceptions occurred while the consumer is trying to pickup incoming messages, or the likes, will now be processed as a message and handled by the routing Error Handler. By default the consumer will use the org.apache.camel.spi.ExceptionHandler to deal with exceptions, that will be logged at WARN or ERROR level and ignored.

false

boolean

iteratorType (consumer)

Defines where in the Kinesis stream to start getting records

TRIM_HORIZON

ShardIteratorType

maxResultsPerRequest (consumer)

Maximum number of records that will be fetched in each poll

1

int

sendEmptyMessageWhenIdle (consumer)

If the polling consumer did not poll any files, you can enable this option to send an empty message (no body) instead.

false

boolean

sequenceNumber (consumer)

The sequence number to start polling from. Required if iteratorType is set to AFTER_SEQUENCE_NUMBER or AT_SEQUENCE_NUMBER

 

String

shardClosed (consumer)

Define what will be the behavior in case of shard closed. Possible value are ignore, silent and fail.In case of ignore a message will be logged and the consumer will restart from the beginning,in case of silent there will be no logging and the consumer will start from the beginning,in case of fail a ReachedClosedStateException will be raised

ignore

KinesisShardClosed StrategyEnum

shardId (consumer)

Defines which shardId in the Kinesis stream to get records from

 

String

exceptionHandler (consumer)

To let the consumer use a custom ExceptionHandler. Notice if the option bridgeErrorHandler is enabled then this options is not in use. By default the consumer will deal with exceptions, that will be logged at WARN or ERROR level and ignored.

 

ExceptionHandler

exchangePattern (consumer)

Sets the exchange pattern when the consumer creates an exchange.

 

ExchangePattern

pollStrategy (consumer)

A pluggable org.apache.camel.PollingConsumerPollingStrategy allowing you to provide your custom implementation to control error handling usually occurred during the poll operation before an Exchange have been created and being routed in Camel.

 

PollingConsumerPoll Strategy

synchronous (advanced)

Sets whether synchronous processing should be strictly used, or Camel is allowed to use asynchronous processing (if supported).

false

boolean

backoffErrorThreshold (scheduler)

The number of subsequent error polls (failed due some error) that should happen before the backoffMultipler should kick-in.

 

int

backoffIdleThreshold (scheduler)

The number of subsequent idle polls that should happen before the backoffMultipler should kick-in.

 

int

backoffMultiplier (scheduler)

To let the scheduled polling consumer backoff if there has been a number of subsequent idles/errors in a row. The multiplier is then the number of polls that will be skipped before the next actual attempt is happening again. When this option is in use then backoffIdleThreshold and/or backoffErrorThreshold must also be configured.

 

int

delay (scheduler)

Milliseconds before the next poll. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).

500

long

greedy (scheduler)

If greedy is enabled, then the ScheduledPollConsumer will run immediately again, if the previous run polled 1 or more messages.

false

boolean

initialDelay (scheduler)

Milliseconds before the first poll starts. You can also specify time values using units, such as 60s (60 seconds), 5m30s (5 minutes and 30 seconds), and 1h (1 hour).

1000

long

runLoggingLevel (scheduler)

The consumer logs a start/complete log line when it polls. This option allows you to configure the logging level for that.

TRACE

LoggingLevel

scheduledExecutorService (scheduler)

Allows for configuring a custom/shared thread pool to use for the consumer. By default each consumer has its own single threaded thread pool.

 

ScheduledExecutor Service

scheduler (scheduler)

To use a cron scheduler from either camel-spring or camel-quartz2 component

none

ScheduledPollConsumer Scheduler

schedulerProperties (scheduler)

To configure additional properties when using a custom scheduler or any of the Quartz2, Spring based scheduler.

 

Map

startScheduler (scheduler)

Whether the scheduler should be auto started.

true

boolean

timeUnit (scheduler)

Time unit for initialDelay and delay options.

MILLISECONDS

TimeUnit

useFixedDelay (scheduler)

Controls if fixed delay or fixed rate is used. See ScheduledExecutorService in JDK for details.

true

boolean

accessKey (security)

Amazon AWS Access Key

 

String

secretKey (security)

Amazon AWS Secret Key

 

String

Required Kinesis component options

You have to provide the amazonKinesisClient in the Registry with proxies and relevant credentials configured.

24.3. Batch Consumer

This component implements the Batch Consumer.

This allows you for instance to know how many messages exists in this batch and for instance let the Aggregator aggregate this number of messages.

24.4. Usage

24.4.1. Message headers set by the Kinesis consumer

HeaderTypeDescription

CamelAwsKinesisSequenceNumber

String

The sequence number of the record. This is represented as a String as it size is not defined by the API. If it is to be used as a numerical type then use

CamelAwsKinesisApproximateArrivalTimestamp

String

The time AWS assigned as the arrival time of the record.

CamelAwsKinesisPartitionKey

String

Identifies which shard in the stream the data record is assigned to.

24.4.2. AmazonKinesis configuration

You will need to create an instance of AmazonKinesisClient and bind it to the registry

ClientConfiguration clientConfiguration = new ClientConfiguration();
clientConfiguration.setProxyHost("http://myProxyHost");
clientConfiguration.setProxyPort(8080);

Region region = Region.getRegion(Regions.fromName(region));
region.createClient(AmazonKinesisClient.class, null, clientConfiguration);
// the 'null' here is the AWSCredentialsProvider which defaults to an instance of DefaultAWSCredentialsProviderChain

registry.bind("kinesisClient", client);

You then have to reference the AmazonKinesisClient in the amazonKinesisClient URI option.

from("aws-kinesis://mykinesisstream?amazonKinesisClient=#kinesisClient")
  .to("log:out?showAll=true");

24.4.3. Providing AWS Credentials

It is recommended that the credentials are obtained by using the DefaultAWSCredentialsProviderChain that is the default when creating a new ClientConfiguration instance, however, a different AWSCredentialsProvider can be specified when calling createClient(…​).

24.4.4. Message headers used by the Kinesis producer to write to Kinesis. The producer expects that the message body is a ByteBuffer.

HeaderTypeDescription

CamelAwsKinesisPartitionKey

String

The PartitionKey to pass to Kinesis to store this record.

CamelAwsKinesisSequenceNumber

String

Optional paramter to indicate the sequence number of this record.

24.4.5. Message headers set by the Kinesis producer on successful storage of a Record

HeaderTypeDescription

CamelAwsKinesisSequenceNumber

String

The sequence number of the record, as defined in Response Syntax

CamelAwsKinesisShardId

String

The shard ID of where the Record was stored

24.5. Dependencies

Maven users will need to add the following dependency to their pom.xml.

pom.xml

<dependency>
    <groupId>org.apache.camel</groupId>
    <artifactId>camel-aws</artifactId>
    <version>${camel-version}</version>
</dependency>

where ${camel-version} must be replaced by the actual version of Camel (2.17 or higher).

24.6. See Also

  • Configuring Camel
  • Component
  • Endpoint
  • Getting Started
  • AWS Component