Based on the context provided, it seems you are encountering an issue where despite having finalizers enabled to prevent premature deletion of resources, you are still receiving messages indicating that resources are being deleted externally or not found. This issue can be complex, involving interactions between Flyte, Kubernetes, and possibly other cloud provider-specific mechanisms (like AWS EKS node management and Auto Scaling Group (ASG) behaviors).
1. *Finalizers and Kubernetes Behavior*: Finalizers are designed to prevent Kubernetes resources from being immediately deleted, allowing for cleanup or other actions to be taken before the deletion is finalized. However, as noted in the discussions, there are scenarios where Kubernetes or external systems might not respect these finalizers. For example, if a pod is OOM (Out of Memory) killed, Kubernetes marks the pod for deletion, and even with a finalizer, the pod's status can lead to confusion for Flyte when it tries to determine the task state.
2. *External Deletions and Auto Scaling*: One specific scenario mentioned involves interaction with AWS EKS node management and ASG Availability Zone rebalancing. It was observed that eviction requests made by AWS-managed lambda functions for AZ rebalancing could lead to pod evictions that seem to bypass the protection offered by finalizers. This suggests that certain cloud-provider-level operations might not fully honor Kubernetes finalizers in the way one might expect.
3. *Investigation and Mitigation Steps*:
• *Review Kubernetes and Cloud Provider Documentation*: Understanding the specifics of how finalizers are treated by Kubernetes and any cloud-provider-specific behaviors (like EKS's node management and ASG rebalancing) is crucial.
• *Check for Configuration Issues*: Ensure that finalizers are correctly configured and applied to your resources. It might also be worth exploring if there are specific configurations within EKS or the ASG that could be adjusted to reduce the likelihood of these issues.
• *Contact Cloud Provider Support*: If the issue seems to be related to cloud-provider-specific behaviors (like the lambda function evictions during AZ rebalancing), reaching out to AWS support for more insights or potential workarounds could be beneficial.
• *Monitor and Adjust Resource Limits*: For cases where pods are being OOM killed, reviewing and possibly adjusting resource requests and limits might help reduce the frequency of such events.
In summary, while finalizers are a powerful feature for managing the lifecycle of Kubernetes resources, their effectiveness can be influenced by a range of factors including Kubernetes internals, cloud-provider-specific behaviors, and resource configuration issues
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