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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