The Amazon Kinesis Client Library for Java (Amazon KCL) enables Java developers to easily consume and process data from Amazon Kinesis.
:warning: It's highly recommended for users of version 2.0 of the Amazon Kinesis Client to upgrade to version 2.0.3 or later. A bug has been identified in versions prior to 2.0.3 that could cause records to be delivered to the wrong record processor.
:information_source: Amazon Kinesis Client versions 1.x are not impacted.
Please open an issue if you have any questions.
After you've downloaded the code from GitHub, you can build it using Maven. To disable GPG signing in the build, use
mvn clean install -Dgpg.skip=true. Note: This command runs Integration tests, which in turn creates AWS
resources (which requires manual cleanup). Integration tests require valid AWS credentials need to be discovered at
runtime. To skip running integration tests, add
-DskipITs option to the build command.
For producer-side developers using the Kinesis Producer Library (KPL), the KCL integrates without additional effort. When the KCL retrieves an aggregated Amazon Kinesis record consisting of multiple KPL user records, it will automatically invoke the KPL to extract the individual user records before returning them to the user.
To make it easier for developers to write record processors in other languages, we have implemented a Java based daemon, called MultiLangDaemon that does all the heavy lifting. Our approach has the daemon spawn a sub-process, which in turn runs the record processor, which can be written in any language. The MultiLangDaemon process and the record processor sub-process communicate with each other over STDIN and STDOUT using a defined protocol. There will be a one to one correspondence amongst record processors, child processes, and shards. For Python developers specifically, we have abstracted these implementation details away and expose an interface that enables you to focus on writing record processing logic in Python. This approach enables KCL to be language agnostic, while providing identical features and similar parallel processing model across all languages.
The recommended way to use the KCL for Java is to consume it from Maven.
<dependency> <groupId>software.amazon.kinesis</groupId> <artifactId>amazon-kinesis-client</artifactId> <version>2.2.11</version> </dependency>
<dependency> <groupId>com.amazonaws</groupId> <artifactId>amazon-kinesis-client</artifactId> <version>1.11.2</version> </dependency>