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[SPARK-42769][K8S] Add SPARK_DRIVER_POD_IP env variable to executor pods #40392

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[SPARK-42769][K8S] Add SPARK_DRIVER_POD_IP env variable to executor pods #40392

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[SPARK-42769][K8S] Add ENV_DRIVER_POD_IP env variable to executor pods
dongjoon-hyun Mar 13, 2023
c153ba2
Revise test case name
dongjoon-hyun Mar 13, 2023
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1 change: 1 addition & 0 deletions resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/Constants.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -54,6 +54,7 @@ private[spark] object Constants {
val UI_PORT_NAME = "spark-ui"

// Environment Variables
val ENV_DRIVER_POD_IP = "SPARK_DRIVER_POD_IP"
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@viirya viirya Mar 13, 2023

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Is it different to DRIVER_HOST_ADDRESS? I saw K8s uses DRIVER_HOST_ADDRESS to derive driver url for env var ENV_DRIVER_URL.

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@dongjoon-hyun dongjoon-hyun Mar 13, 2023

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Thank you for review, @viirya .

In K8s, DRIVER_HOST_ADDRESS is protected by DriverServiceFeatureStep here.

spark/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverServiceFeatureStep.scala

Line 109 in 7fccd67

val DRIVER_HOST_KEY = config.DRIVER_HOST_ADDRESS.key

spark/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverServiceFeatureStep.scala

Lines 38 to 40 in 7fccd67

require(kubernetesConf.getOption(DRIVER_HOST_KEY).isEmpty,
s"$DRIVER_HOST_KEY is not supported in Kubernetes mode, as the driver's hostname will be " +
"managed via a Kubernetes service.")

It's because we inject like this systematically.

spark/resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/DriverServiceFeatureStep.scala

Lines 67 to 68 in 7fccd67

val driverHostname = s"$resolvedServiceName.${kubernetesConf.namespace}.svc"
Map(DRIVER_HOST_KEY -> driverHostname,

However, when DNS doesn't work, we need IP which is unknown from the executor pods so far.

val ENV_DRIVER_URL = "SPARK_DRIVER_URL"
val ENV_EXECUTOR_CORES = "SPARK_EXECUTOR_CORES"
val ENV_EXECUTOR_MEMORY = "SPARK_EXECUTOR_MEMORY"
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1 change: 1 addition & 0 deletions resource-managers/kubernetes/docker/src/main/dockerfiles/spark/entrypoint.sh
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Expand Up @@ -81,6 +81,7 @@ case "$1" in
CMD=(
"$SPARK_HOME/bin/spark-submit"
--conf "spark.driver.bindAddress=$SPARK_DRIVER_BIND_ADDRESS"
--conf "spark.executorEnv.SPARK_DRIVER_POD_IP=$SPARK_DRIVER_BIND_ADDRESS"
--deploy-mode client
"$@"
)
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9 changes: 9 additions & 0 deletions ...on-tests/src/test/scala/org/apache/spark/deploy/k8s/integrationtest/BasicTestsSuite.scala
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Expand Up @@ -159,6 +159,15 @@ private[spark] trait BasicTestsSuite { k8sSuite: KubernetesSuite =>
runSparkRemoteCheckAndVerifyCompletion(appArgs = Array(REMOTE_PAGE_RANK_FILE_NAME))
}
}

test("SPARK-42769: All executor pods have SPARK_DRIVER_POD_IP env variable", k8sTestTag) {
runSparkPiAndVerifyCompletion(
executorPodChecker = (executorPod: Pod) => {
doBasicExecutorPodCheck(executorPod)
executorPod.getSpec.getContainers.get(0).getEnv.asScala
.exists(envVar => envVar.getName == "SPARK_DRIVER_POD_IP")
})
}
}

private[spark] object BasicTestsSuite extends SparkFunSuite {
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