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Posted to issues@spark.apache.org by "Anmol Khurana (JIRA)" <ji...@apache.org> on 2018/11/01 23:42:00 UTC
[jira] [Created] (SPARK-25922) [K8] Spark Driver/Executor
"spark-app-selector" label mismatch
Anmol Khurana created SPARK-25922:
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Summary: [K8] Spark Driver/Executor "spark-app-selector" label mismatch
Key: SPARK-25922
URL: https://issues.apache.org/jira/browse/SPARK-25922
Project: Spark
Issue Type: Bug
Components: Kubernetes
Affects Versions: 2.4.0
Environment: Spark 2.4.0 RC4
Reporter: Anmol Khurana
Hi,
I have been testing Spark 2.4.0 RC4 on Kubernetes to run Python Spark Applications and running into an issue where the AppId label on the driver and executors mis-match. I am using the [https://github.com/GoogleCloudPlatform/spark-on-k8s-operator] to run these applications.
I see a spark.app.id of the form spark-* as "spark-app-selector" label ([https://github.com/apache/spark/blob/f6cc354d83c2c9a757f9b507aadd4dbdc5825cca/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/Constants.scala#L22|https://github.com/apache/spark/blob/f6cc354d83c2c9a757f9b507aadd4dbdc5825cca/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/Constants.scala#L22)]) on the driver as well as in the K8 config-map which gets created for the driver via spark-submit . My guess is this is coming from [https://github.com/apache/spark/blob/f6cc354d83c2c9a757f9b507aadd4dbdc5825cca/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/submit/KubernetesClientApplication.scala#L211]
But when the driver actually comes up (https://github.com/apache/spark/blob/master/resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh#L99) and brings up executors etc. , I see that the "spark-app-selector" label on the executors as well as the spark.app.Id config within the user-code on the driver is something of the form spark-application-* ( probably from [https://github.com/apache/spark/blob/b19a28dea098c7d6188f8540429c50f42952d678/core/src/main/scala/org/apache/spark/SparkContext.scala#L511] & [https://github.com/apache/spark/blob/bfb74394a5513134ea1da9fcf4a1783b77dd64e4/core/src/main/scala/org/apache/spark/scheduler/SchedulerBackend.scala#L26)]
We were consuming this "spark-app-selector" label on the Driver Pod to get the App Id and use it to look-up the app in SparkHistory server (among other use-cases). but due to this mis-match, this logic no longer works. This was working fine in Spark 2.2 fork for Kubernetes which i was using earlier.
Is this expected behavior and if yes, what's the correct way to fetch the applicationId from outside the application ?
Let me know if I can provide any more details or if I am doing something wrong.
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