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📥 Commits

Reviewing files that changed from the base of the PR and between ed79212 and 5989a26.

📒 Files selected for processing (13)
  • Vagrantfile (1 hunks)
  • clients/src/main/java/org/apache/kafka/common/config/AbstractConfig.java (4 hunks)
  • clients/src/main/java/org/apache/kafka/common/config/ConfigTransformer.java (3 hunks)
  • clients/src/main/java/org/apache/kafka/common/config/provider/ConfigProvider.java (1 hunks)
  • clients/src/test/java/org/apache/kafka/common/config/ConfigTransformerTest.java (5 hunks)
  • clients/src/test/java/org/apache/kafka/common/config/provider/MonitorableConfigProvider.java (1 hunks)
  • connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorMakerConfig.java (2 hunks)
  • connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Worker.java (1 hunks)
  • connect/runtime/src/main/java/org/apache/kafka/connect/runtime/WorkerConfigTransformer.java (3 hunks)
  • connect/runtime/src/main/java/org/apache/kafka/connect/runtime/isolation/Plugins.java (3 hunks)
  • connect/runtime/src/test/java/org/apache/kafka/connect/runtime/WorkerConfigTransformerTest.java (5 hunks)
  • connect/runtime/src/test/java/org/apache/kafka/connect/runtime/WorkerTest.java (5 hunks)
  • connect/runtime/src/test/java/org/apache/kafka/connect/runtime/isolation/PluginsTest.java (4 hunks)
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Summary of Changes

Hello @DDShantanuBadmanji, 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 introduces a significant architectural enhancement by wrapping ConfigProvider instances in a generic Plugin object. This change streamlines the management of configuration providers, ensuring a more uniform lifecycle and enabling them to seamlessly integrate with Kafka's metrics system. By allowing ConfigProviders to implement the Monitorable interface, this PR improves the observability of custom configuration providers, making it easier to monitor their performance and health within Kafka Connect and other Kafka client applications.

Highlights

  • ConfigProvider Plugin Wrapper: ConfigProvider instances are now encapsulated within a Plugin object, standardizing their lifecycle management and enabling consistent handling across Kafka components.
  • Metrics for ConfigProviders: ConfigProvider implementations can now expose operational metrics by implementing the Monitorable interface, with automatic tagging for easy identification and monitoring.
  • Refactored Instantiation Logic: The process of instantiating ConfigProviders has been updated in core components like AbstractConfig, Worker, and MirrorMakerConfig to leverage the new Plugin wrapper and facilitate metrics integration.
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Code Review

This pull request introduces monitoring capabilities for ConfigProvider implementations by wrapping them in a Plugin object. This allows ConfigProviders that implement the Monitorable interface to register their own metrics. The changes involve refactoring various parts of the codebase, including AbstractConfig, ConfigTransformer, and several classes in the connect module, to use Plugin<ConfigProvider> instead of the raw ConfigProvider. The changes are well-contained and include corresponding updates to tests, as well as new tests for the monitoring functionality. My feedback includes one correction to ensure metric tags are consistent across different instantiation paths.

ConfigProvider provider = Utils.newInstance(entry.getValue(), ConfigProvider.class);
provider.configure(configProperties);
configProviderInstances.put(entry.getKey(), provider);
Plugin<ConfigProvider> providerPlugin = Plugin.wrapInstance(provider, null, CONFIG_PROVIDERS_CONFIG);

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medium

The Plugin.wrapInstance call is missing the provider tag for metrics. The documentation for ConfigProvider states that a provider tag with the provider name will be automatically added to all registered metrics. This is not happening here, which will lead to inconsistent metric tags for config providers instantiated via AbstractConfig. The provider name is available as entry.getKey().

Suggested change
Plugin<ConfigProvider> providerPlugin = Plugin.wrapInstance(provider, null, CONFIG_PROVIDERS_CONFIG);
Plugin<ConfigProvider> providerPlugin = Plugin.wrapInstance(provider, null, CONFIG_PROVIDERS_CONFIG, Map.of("provider", entry.getKey()));

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