[Feat] Improve ModelAdapter reliability with retry and pod switching #1472
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Summary of Changes
Hello @Jeffwan, 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 the reliability and robustness of the ModelAdapter controller. The core changes revolve around making the adapter loading process more resilient to transient failures and improving how pods are selected and managed. It introduces sophisticated retry logic with exponential backoff, validates pod readiness before scheduling, and intelligently handles connection errors. Furthermore, the controller now tracks loading attempts per pod and can automatically switch to healthy alternative pods if a specific pod consistently fails. These improvements ensure a more stable and self-healing system for managing model adapters.
Highlights
- Enhanced Reliability with Retries: Implemented a retry mechanism with exponential backoff (5 retries, 5-second intervals) for model adapter loading operations, significantly improving resilience to transient network issues or temporary pod unreadiness.
- Improved Pod Readiness Checks: Introduced robust pod readiness validation, ensuring that model adapters are only scheduled on pods that are truly ready and stable, preventing premature scheduling and associated failures.
- Refined Error Handling: Added comprehensive connection error handling, specifically addressing 'connection refused' and other common network errors during startup, classifying them as retriable to allow the system to recover gracefully.
- Optimized Instance Tracking: Modified the scheduling flow to only add pods to the
instance.Status.Instanceslist after a successful adapter loading, ensuring that only fully functional instances are tracked. - Automatic Pod Switching: Implemented automatic pod switching by tracking retry attempts per pod using annotations, allowing the controller to intelligently move to a different pod if a current one repeatedly fails to load the adapter.
- HTTP Timeouts: Integrated HTTP timeouts into network requests to prevent operations from hanging indefinitely, improving the overall responsiveness and stability of the controller.
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Code Review
This pull request significantly enhances the reliability of the ModelAdapter controller by introducing a robust retry mechanism, pod readiness checks, and improved error handling. The changes to defer adding pods to the instance list until after a successful load, along with adding HTTP timeouts, are excellent improvements. The new unit tests also greatly increase confidence in the controller's logic. My review identifies a critical issue with the format of annotation keys which will cause API errors, a high-severity logical gap between pod selection and loading that bypasses the scheduler's decisions, and a medium-severity point about implementing a true exponential backoff as described in the PR.
Jeffwan
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Currently, there's no owner for this component, I will skip the official review process and merge it after CI pass. |
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/cc @googs1025 currently I still add integration tests in existing test file, a follow up PR is needed to follow your suggested pattern. |
…mechanisms
- Add retry mechanism with exponential backoff (5 retries, 5s intervals)
- Add connection error handling for startup scenarios ("connection refused")
- Only add pods to instances list after successful adapter loading
- Support automatic pod switching when loading fails repeatedly
- Maintain backward compatibility with existing deployments
Fixes: vllm-project#256, vllm-project#258, vllm-project#363
Signed-off-by: Jiaxin Shan <[email protected]>
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part of #1396 |
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I refactor the lora code a little bit to improve the reliability, those are all remaining issues from original release.
Pull Request Description
[Please provide a clear and concise description of your changes here]
Related Issues
Resolves: Address #256, #258, #363
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