Flink jar-runner

Flink jar-runner is a utility designed to simplify the deployment of Apache Flink applications by managing environment variables, SQL script execution, compiled plan management, and JAR dependency resolution. This tool makes it easy to deploy Flink applications without needing to manually build JAR files.

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Features

• SQL Script Execution: Run SQL scripts directly within Flink.
• Compiled Plan Support: Execute pre-compiled Flink plans without hassle.
• Environment Variable Substitution: Automatically resolve and substitute environment variables in your configurations and SQL scripts.
• JAR Dependency Management: Simplifies pointing to directories with JAR files required by Flink jobs.
• Kubernetes-Friendly: Works seamlessly with the Flink Operator for Kubernetes deployments.
• Maven and Docker Support: Available on Maven Central and Docker Hub for easy setup.

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Installation

Maven

Add the following to your pom.xml:

<dependency>
<groupId>com.datasqrl</groupId>
<artifactId>flink-jar-runner</artifactId>
<version>1.0.0</version>
</dependency>

Docker

Pull the latest Docker image from Docker Hub:

docker pull datasqrl/flink-jar-runner:latest

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Usage

Command-Line Interface

The tool can be executed via the command line with the following arguments:

Argument	Description
--sql-schema	Path to the SQL schema file
--compiled-plan	Path to the compiled plan JSON file
--system-jars	Directory containing additional JAR files
--local-mode	tbd

Example usage:

java -jar flink-jar-runner.jar \
--sql-schema /path/to/schema.sql \
--compiled-plan /path/to/compiledplan.json \
--system-jars /path/to/jars

Environment Variable Substitution

The tool automatically substitutes environment variables in your configuration files and SQL scripts, ensuring smooth deployment across different environments.

CREATE TEMPORARY TABLE `MyTable` (
  ...
) WITH (
  'connector' = 'filesystem',
  'format' = 'json',
  'path' = '${DATA_PATH}/applications.jsonl',
  'source.monitor-interval' = '1'
);

Kubernetes Deployment with Flink Operator

Here's how to use Flink Jar Runner with the Flink Operator on Kubernetes:

1. Prepare Your Files: Ensure that your SQL scripts (schema.sql), compiled plans (compiledplan.json), and JAR files are accessible within your container.

2. Example Helm Chart Configuration:

apiVersion: flink.apache.org/v1beta1
kind: FlinkDeployment
metadata:
  name: sql-example
spec:
  image: datasqrl/flink-jar-runner:latest
  flinkVersion: v1_19
  flinkConfiguration:
    taskmanager.numberOfTaskSlots: "1"
  serviceAccount: flink
  jobManager:
    resource:
      memory: "2048m"
      cpu: 1
  taskManager:
    resource:
      memory: "2048m"
      cpu: 1
  job:
    jarURI: http://raw.github.com/datasqrl/releases/1.0.0/flink-jar-runner.jar
    args: ["--sql-schema", "/opt/flink/usrlib/sql-scripts/schema.sql", "--compiled-plan", "/opt/flink/usrlib/sql-scripts/compiledplan.json", "--system-jars", "/opt/flink/usrlib/jars"]
    parallelism: 1
    upgradeMode: stateless

1. Deploy with Helm:

helm install sql-example -f your-helm-values.yaml your-helm-chart

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Example

Running Flink jar-runner locally:

java -jar flink-jar-runner.jar \
--sql-schema /path/to/schema.sql \
--compiled-plan /path/to/compiledplan.json \
--system-jars /path/to/jars \
--local-mode

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Getting the JAR

You can download the JAR directly from Maven Central or Docker Hub:

• Maven:

<dependency>
<groupId>com.datasqrl</groupId>
<artifactId>flink-jar-runner</artifactId>
<version>1.0.0</version>
</dependency>

• Docker:

docker pull datasqrl/flink-jar-runner:latest

Contributing

Contributions are welcome! Feel free to open an issue or submit a pull request on GitHub.

License

This project is licensed under the Apache 2 License. See the LICENSE file for details.

Contact

For any questions or support, please open an issue in the GitHub repository.