Use retry framework for DirectPath verification stat call#4667
Use retry framework for DirectPath verification stat call#4667vadlakondaswetha wants to merge 1 commit intomasterfrom
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…stat call Co-authored-by: vadlakondaswetha <101323867+vadlakondaswetha@users.noreply.github.com>
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Summary of ChangesHello, 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 refactors the DirectPath connectivity verification process to utilize the existing storage retry utility. By moving away from manual retry configuration management, the implementation ensures more consistent handling of connection stalls and better integration with fallback metrics. The changes also introduce necessary flexibility in the retry configuration to support specific backoff requirements for the detection phase. Highlights
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Code Review
This pull request refactors DirectPath connectivity verification to use a localized retry loop and adds a SetBackoffOverrides method to the RetryConfig struct. Key feedback points out critical issues such as nested retries between the SDK and the new loop, a regression in metric collection, and improper gating of retry logic. Additionally, the reviewer recommended clarifying the request description and correcting misleading comments about the execution paths.
| retryConfig := storageutil.NewRetryConfig(clientConfig, directPathDetectionTimeout, directPathDetectionMaxRetryDuration, storageutil.DefaultInitialBackoff) | ||
| retryConfig.SetBackoffOverrides(1.5, directPathDetectionMaxBackoff) | ||
| reqDescription := fmt.Sprintf("VerifyDirectPathConnectivity %q", testObject) | ||
| _, statErr = storageutil.ExecuteWithRetryAtLogLevel(ctx, retryConfig, "VerifyDirectPathConnectivity", reqDescription, apiCall, logger.LevelTrace) |
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This implementation introduces nested retries, which can lead to significantly longer wait times than intended.
- The sc client is already configured with production retry settings at line 204.
- ExecuteWithRetryAtLogLevel wraps the apiCall in a second retry loop using the detection configuration.
When a call fails, the Go Storage SDK will first perform its own retries (production config) inside the apiCall, and then ExecuteWithRetryAtLogLevel will retry that entire process again. To use the custom retry framework effectively, you should ensure the underlying SDK retries are disabled (e.g., by setting MaxAttempts to 1 on the client) for the duration of this check, similar to how the previous implementation swapped the configuration.
| retryConfig := storageutil.NewRetryConfig(clientConfig, directPathDetectionTimeout, directPathDetectionMaxRetryDuration, storageutil.DefaultInitialBackoff) | ||
| retryConfig.SetBackoffOverrides(1.5, directPathDetectionMaxBackoff) | ||
| reqDescription := fmt.Sprintf("VerifyDirectPathConnectivity %q", testObject) | ||
| _, statErr = storageutil.ExecuteWithRetryAtLogLevel(ctx, retryConfig, "VerifyDirectPathConnectivity", reqDescription, apiCall, logger.LevelTrace) |
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There appears to be a regression in metric collection. The previous implementation used storageutil.ShouldRetryWithMonitoring, which explicitly recorded metrics for each retry attempt. The new implementation uses storageutil.ExecuteWithRetryAtLogLevel, which calls ShouldRetry(err) internally. Based on the provided code for ExecuteWithRetryAtLogLevel, it does not take a MetricHandle or perform any monitoring, which contradicts the PR description's claim that "fallback metrics are integrated correctly".
| _, statErr := bucketHandle.Object(testObject).Attrs(verifyCtx) | ||
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| var statErr error | ||
| if clientConfig != nil && clientConfig.MetricHandle != nil { |
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The condition clientConfig.MetricHandle != nil incorrectly gates the use of the retry framework. If metrics are disabled in production, the DirectPath verification will skip the specialized retry logic and fall back to the else block. This reduces the robustness of the connectivity check. Following the repository's preference for using no-op implementations instead of nil for interface arguments, the retry framework should be used regardless of whether the metric handle is present.
References
- In tests, prefer using no-op implementations (e.g., tracing.NewNoopTracer(), metrics.NewNoopMetrics()) over nil for interface arguments to prevent potential nil pointer panics and improve consistency.
| if clientConfig != nil && clientConfig.MetricHandle != nil { | ||
| retryConfig := storageutil.NewRetryConfig(clientConfig, directPathDetectionTimeout, directPathDetectionMaxRetryDuration, storageutil.DefaultInitialBackoff) | ||
| retryConfig.SetBackoffOverrides(1.5, directPathDetectionMaxBackoff) | ||
| reqDescription := fmt.Sprintf("VerifyDirectPathConnectivity %q", testObject) |
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The reqDescription is redundant as it repeats the operation name. It would be cleaner to provide a description that identifies the resource being checked.
| reqDescription := fmt.Sprintf("VerifyDirectPathConnectivity %q", testObject) | |
| reqDescription := fmt.Sprintf("bucket %q object %q", bucketName, testObject) |
| reqDescription := fmt.Sprintf("VerifyDirectPathConnectivity %q", testObject) | ||
| _, statErr = storageutil.ExecuteWithRetryAtLogLevel(ctx, retryConfig, "VerifyDirectPathConnectivity", reqDescription, apiCall, logger.LevelTrace) | ||
| } else { | ||
| // When tests run without Viper config, execute without retry loop |
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The comment here is misleading. This block is executed whenever MetricHandle is nil, which is not exclusive to tests (it happens if metrics are disabled in config). Additionally, because sc is configured with production retries at line 204, the apiCall will still perform retries via the SDK, so it is not truly executing "without retry loop". Consistent with the repository's preference for using no-op implementations instead of nil for interface arguments, the logic should ideally not be gated by a nil check.
References
- In tests, prefer using no-op implementations (e.g., tracing.NewNoopTracer(), metrics.NewNoopMetrics()) over nil for interface arguments to prevent potential nil pointer panics and improve consistency.
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Additional details and impacted files@@ Coverage Diff @@
## master #4667 +/- ##
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+ Coverage 0 83.70% +83.70%
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Files 0 165 +165
Lines 0 20485 +20485
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+ Hits 0 17147 +17147
- Misses 0 2698 +2698
- Partials 0 640 +640
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Hi @charith87, your feedback is needed to move this pull request forward. This automated reminder was triggered because there has been no activity for over 24 hours. Please provide your input when you have a moment. Thank you! |
Use storageutil.ExecuteWithRetryAtLogLevel to wrap the
Statcall for DirectPath connectivity validation. This ensures connection stalls are correctly managed within the retry backoff loop, and fallback metrics are integrated correctly. Added an exported method for RetryConfig to override backoff limits.PR created automatically by Jules for task 1834218318169272590 started by @vadlakondaswetha