Add Support for EnvoyRateLimiter Implementation

[tarun-google]

Adding Envoy RateLimiter as a implementation of RateLimiter abstraction defined in #37547

https://pantheon.corp.google.com/dataflow/jobs/us-central1/2026-02-11_14_28_06-3806354753980489202

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Summary of Changes

Hello @tarun-google, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly enhances Apache Beam's I/O components by integrating support for the Envoy Rate Limit Service. This allows Beam pipelines to enforce external rate limits on operations that interact with external services, preventing overload and ensuring stable system behavior. The changes introduce a new Envoy-specific rate limiter implementation, along with supporting infrastructure for configuration, client management, and an illustrative example, making it easier for users to apply sophisticated rate limiting strategies within their data processing workflows.

Highlights

• Envoy RateLimiter Implementation: Introduced a new EnvoyRateLimiter class, implementing the RateLimiter abstraction, to enable rate limiting using an external Envoy Rate Limit Service (RLS).
• Envoy RateLimiter Factory and Context: Added EnvoyRateLimiterFactory for creating and managing Envoy-based rate limiters, and EnvoyRateLimiterContext to define the domain and descriptors for specific rate limit buckets.
• RateLimiter Client Cache: Implemented RateLimiterClientCache to efficiently manage and share gRPC channels to the Envoy RLS across multiple DoFn instances within a worker, using reference counting for proper lifecycle management.
• RateLimiter Options: Defined RateLimiterOptions to configure the address, timeout, and retry behavior for the Envoy Rate Limit Service.
• Example Usage: Provided a new example, RateLimiterSimple.java, demonstrating how to integrate and use the Envoy RateLimiter within a Beam pipeline to control external service calls.
• Build System Updates: Updated Gradle build files to include necessary dependencies for Envoy control plane API, gRPC, and AutoValue, ensuring the new components can be built and utilized.
• Comprehensive Testing: Included unit tests for EnvoyRateLimiterFactory, RateLimiterClientCache, and RateLimiterOptions to ensure the correctness and robustness of the new rate limiting components.

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Changelog

• buildSrc/src/main/groovy/org/apache/beam/gradle/BeamModulePlugin.groovy
  • Added envoy_control_plane_api dependency to the build configuration.
• examples/java/build.gradle
  • Added sdks:java:io:components project as an implementation dependency.
• examples/java/src/main/java/org/apache/beam/examples/RateLimiterSimple.java
  • Added a new example demonstrating the usage of EnvoyRateLimiter within a Beam pipeline.
• sdks/java/io/components/build.gradle
  • Added auto_value_annotations, envoy_control_plane_api, grpc_api, grpc_stub, and grpc_protobuf dependencies.
• sdks/java/io/components/src/main/java/org/apache/beam/sdk/io/components/ratelimiter/EnvoyRateLimiter.java
  • Added the EnvoyRateLimiter class, which implements the RateLimiter interface using an Envoy-based factory and context.
• sdks/java/io/components/src/main/java/org/apache/beam/sdk/io/components/ratelimiter/EnvoyRateLimiterContext.java
  • Added the EnvoyRateLimiterContext class, an AutoValue-generated class for defining Envoy rate limiter domains and descriptors.
• sdks/java/io/components/src/main/java/org/apache/beam/sdk/io/components/ratelimiter/EnvoyRateLimiterFactory.java
  • Added the EnvoyRateLimiterFactory class, responsible for creating Envoy rate limiters, managing gRPC communication, and handling retries and throttling signals.
• sdks/java/io/components/src/main/java/org/apache/beam/sdk/io/components/ratelimiter/RateLimiterClientCache.java
  • Added the RateLimiterClientCache class, providing a static cache for gRPC ManagedChannel instances to the Rate Limit Service with reference counting.
• sdks/java/io/components/src/main/java/org/apache/beam/sdk/io/components/ratelimiter/RateLimiterOptions.java
  • Added the RateLimiterOptions class, an AutoValue-generated class for configuring rate limiter parameters like address, max retries, and timeout.
• sdks/java/io/components/src/test/java/org/apache/beam/sdk/io/components/ratelimiter/EnvoyRateLimiterTest.java
  • Added unit tests for the EnvoyRateLimiterFactory to verify its behavior under various conditions, including successful allowance, over-limit responses, and RPC errors.
• sdks/java/io/components/src/test/java/org/apache/beam/sdk/io/components/ratelimiter/RateLimiterClientCacheTest.java
  • Added unit tests for the RateLimiterClientCache to ensure correct caching, reference counting, and concurrent access behavior.
• sdks/java/io/components/src/test/java/org/apache/beam/sdk/io/components/ratelimiter/RateLimiterOptionsTest.java
  • Added unit tests for the RateLimiterOptions class to validate its construction and argument checks.

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