[jira] [Assigned] (FLINK-31234) Add an option to redirect stdout/stderr for flink on kubernetes

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

     [ https://issues.apache.org/jira/browse/FLINK-31234?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Yang Wang reassigned FLINK-31234:
---------------------------------

    Assignee: Weihua Hu

> Add an option to redirect stdout/stderr for flink on kubernetes
> ---------------------------------------------------------------
>
>                 Key: FLINK-31234
>                 URL: https://issues.apache.org/jira/browse/FLINK-31234
>             Project: Flink
>          Issue Type: Improvement
>          Components: Deployment / Kubernetes
>    Affects Versions: 1.17.0
>            Reporter: Weihua Hu
>            Assignee: Weihua Hu
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 1.18.0
>
>
> Flink on Kubernetes does not support redirecting stdout/stderr to files. This is to allow users to get logs via "kubectl logs".
> But for our internal scenario, we use a kubernetes user to submit all jobs to the k8s cluster and provide a platform for users to submit jobs. Users can't access kubernetes directly. so we need to display logs/stdout in flink webui.
> Because the web ui retrieves the stdout file by filename, which has the same prefix as \{taskmanager}.log (such as flink--kubernetes-taskmanager-0-my-first-flink-cluster-taskmanager-1-4.log). We can't support this with a simple custom image.
> IMO, we should add an option to redirect stdout/stderr to files. When this setting is enabled.
> 1. flink-console.sh will redirect stdout/err to files.
> 2. avoid logs twices in the log file and the stdout file. we could do this by using ThresholdFilter ([log4j|https://logging.apache.org/log4j/2.x/manual/filters.html#ThresholdFilter] and [logback|https://logback.qos.ch/manual/filters.html#thresholdFilter]) with a system property.
> Of course, this option is false by default.



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