[jira] [Created] (FLINK-35103) [Plugin] Enhancing Flink Failure Management in Kubernetes with Dynamic Termination Log Integration

["SwathiChandrashekar (Jira)" <ji...@apache.org>]

SwathiChandrashekar created FLINK-35103:
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             Summary: [Plugin] Enhancing Flink Failure Management in Kubernetes with Dynamic Termination Log Integration
                 Key: FLINK-35103
                 URL: https://issues.apache.org/jira/browse/FLINK-35103
             Project: Flink
          Issue Type: Improvement
          Components: API / Core
            Reporter: SwathiChandrashekar
             Fix For: 1.20.0
         Attachments: Status-pod.png

Currently, whenever we have flink failures, we need to manually do the triaging by looking into the flink logs even for the initial analysis. It would have been better, if the user/admin directly gets the initial failure information even before looking into the logs.

To address this, we've developed a comprehensive solution via a plugin aimed at helping fetch the Flink failures, ensuring critical data is preserved for subsequent analysis and action.

 

In Kubernetes environments, troubleshooting pod failures can be challenging without checking the pod/flink logs. Fortunately, Kubernetes offers a robust mechanism to enhance debugging capabilities by leveraging the /dev/termination-log file.

[https://kubernetes.io/docs/tasks/debug/debug-application/determine-reason-pod-failure/]

By writing failure information to this log, Kubernetes automatically incorporates it into the container status, providing administrators and developers with valuable insights into the root cause of failures.

Our solution capitalizes on this Kubernetes feature to seamlessly integrate Flink failure reporting within the container ecosystem. Whenever a Flink encounters an issue, our plugin dynamically captures and logs the pertinent failure information into the /dev/termination-log file. This ensures that Kubernetes recognizes and propagates the failure status throughout the container ecosystem, enabling efficient monitoring and response mechanisms.

By leveraging Kubernetes' native functionality in this manner, our plugin ensures that Flink failure incidents are promptly identified and reflected in the pod status. This technical integration streamlines the debugging process, empowering operators to swiftly diagnose and address issues, thereby minimizing downtime and maximizing system reliability.

 

In-order to make this plugin generic, by default it doesn't do any action.  We can configure this by using

*external.log.factory.class : org.apache.flink.externalresource.log.K8SSupportTerminationLog*

This will be present in the plugins directory
PFA for the pod status

 

 



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