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https://issues.apache.org/jira/browse/FLINK-33926?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17987019#comment-17987019
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Ferenc Csaky commented on FLINK-33926:
--------------------------------------
[~tinaselenge] , can you open a backport PR against the {{release-2.1}} branch?
IMO it would worth to push this out the door in that release and do not wait
for another 6 month for Flink 2.2 and the operator to support that version.
> Can't start a job with a jar in the system classpath in native k8s mode
> -----------------------------------------------------------------------
>
> Key: FLINK-33926
> URL: https://issues.apache.org/jira/browse/FLINK-33926
> Project: Flink
> Issue Type: Bug
> Components: Deployment / Kubernetes
> Affects Versions: 2.0.0, 1.19.3, 1.20.2, 2.1.0
> Reporter: Trystan
> Assignee: Gantigmaa Selenge
> Priority: Major
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> It appears that the combination of the running operator-controlled jobs in
> native k8s + application mode + using a job jar in the classpath is invalid.
> Avoiding dynamic classloading (as specified in the
> [docs|https://nightlies.apache.org/flink/flink-docs-release-1.16/docs/ops/debugging/debugging_classloading/#avoiding-dynamic-classloading-for-user-code])
> is beneficial for some jobs. This affects at least Flink 1.16.1 and
> Kubernetes Operator 1.6.0.
>
> FLINK-29288 seems to have addressed this for standalone mode. If I am
> misunderstanding how to correctly build jars for this native k8s scenario,
> apologies for the noise and any pointers would be appreciated!
>
> Perhaps related, the [spec
> documentation|https://nightlies.apache.org/flink/flink-kubernetes-operator-docs-main/docs/custom-resource/reference/#jobspec]
> declares it optional, but isn't clear about under what conditions that
> applies.
> * Putting the jar in the system classpath and pointing *jarURI* to that jar
> leads to linkage errors.
> * Not including *jarURI* leads to NullPointerExceptions in the operator:
> {code:java}
> {"type":"org.apache.flink.kubernetes.operator.exception.ReconciliationException","message":"java.lang.NullPointerException","stackTrace":"org.apache.flink.kubernetes.operator.exception.ReconciliationException:
> java.lang.NullPointerException\n\tat
> org.apache.flink.kubernetes.operator.controller.FlinkDeploymentController.reconcile(FlinkDeploymentController.java:148)\n\tat
>
> org.apache.flink.kubernetes.operator.controller.FlinkDeploymentController.reconcile(FlinkDeploymentController.java:56)\n\tat
>
> io.javaoperatorsdk.operator.processing.Controller$1.execute(Controller.java:138)\n\tat
>
> io.javaoperatorsdk.operator.processing.Controller$1.execute(Controller.java:96)\n\tat
>
> org.apache.flink.kubernetes.operator.metrics.OperatorJosdkMetrics.timeControllerExecution(OperatorJosdkMetrics.java:80)\n\tat
>
> io.javaoperatorsdk.operator.processing.Controller.reconcile(Controller.java:95)\n\tat
>
> io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.reconcileExecution(ReconciliationDispatcher.java:139)\n\tat
>
> io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.handleReconcile(ReconciliationDispatcher.java:119)\n\tat
>
> io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.handleDispatch(ReconciliationDispatcher.java:89)\n\tat
>
> io.javaoperatorsdk.operator.processing.event.ReconciliationDispatcher.handleExecution(ReconciliationDispatcher.java:62)\n\tat
>
> io.javaoperatorsdk.operator.processing.event.EventProcessor$ReconcilerExecutor.run(EventProcessor.java:414)\n\tat
> java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown
> Source)\n\tat
> java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown
> Source)\n\tat java.base/java.lang.Thread.run(Unknown Source)\nCaused by:
> java.lang.NullPointerException\n\tat
> org.apache.flink.kubernetes.utils.KubernetesUtils.checkJarFileForApplicationMode(KubernetesUtils.java:407)\n\tat
>
> org.apache.flink.kubernetes.KubernetesClusterDescriptor.deployApplicationCluster(KubernetesClusterDescriptor.java:207)\n\tat
>
> org.apache.flink.client.deployment.application.cli.ApplicationClusterDeployer.run(ApplicationClusterDeployer.java:67)\n\tat
>
> org.apache.flink.kubernetes.operator.service.NativeFlinkService.deployApplicationCluster(Native","additionalMetadata":{},"throwableList":[{"type":"java.lang.NullPointerException","additionalMetadata":{}}]}
> {code}
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