[jira] [Commented] (FLINK-32980) Support env.java.opts.all & env.java.opts.cli config for starting Session clusters

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

    [ https://issues.apache.org/jira/browse/FLINK-32980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17759546#comment-17759546 ] 

Zhanghao Chen commented on FLINK-32980:
---------------------------------------

Hi [~huweihua], do you think it valid? If so, could you assign this to me? I'd be willing to volunteer.

> Support env.java.opts.all & env.java.opts.cli config for starting Session clusters
> ----------------------------------------------------------------------------------
>
>                 Key: FLINK-32980
>                 URL: https://issues.apache.org/jira/browse/FLINK-32980
>             Project: Flink
>          Issue Type: Improvement
>          Components: Command Line Client, Deployment / Scripts
>    Affects Versions: 1.18.0
>            Reporter: Zhanghao Chen
>            Priority: Minor
>             Fix For: 1.19.0
>
>
> *Problem*
> The following configs are supposed to be supported:
> |h5. env.java.opts.all|(none)|String|Java options to start the JVM of all Flink processes with.|
> |h5. env.java.opts.client|(none)|String|Java options to start the JVM of the Flink Client with.|
> However, the two configs do not take effect for starting Flink session clusters using kubernetes-session.sh and yarn-session.sh. This can lead to problems in complex production envs. For example, in my company, some nodes are IPv6-only, and the connection between Flink client and K8s/YARN control plane is via a domain name whose backend is on IPv4/v6 dual stack, and the JVM arg -Djava.net.preferIPv6Addresses=true needs to be set to make Java connect to IPv6 addresses in favor of IPv4 ones otherwise the K8s/YARN control plane is inaccessible.
>  
> *Proposal*
> The fix is straight-forward, simply apply the following changes to the session scripts:
> `
> FLINK_ENV_JAVA_OPTS="${FLINK_ENV_JAVA_OPTS} ${FLINK_ENV_JAVA_OPTS_CLI}"
> exec $JAVA_RUN $JVM_ARGS $FLINK_ENV_JAVA_OPTS xxx
> `



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