[SPARK-55704] Add Constants.PVC_ACCESS_MODE for reuse

Author: dongjoon-hyun

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

@@ -102,6 +102,7 @@ object Constants {
   val POD_TEMPLATE_KEY = "podspec-configmap-key"
 
   // Miscellaneous
+  val PVC_ACCESS_MODE = "ReadWriteOncePod"
   val KUBERNETES_MASTER_INTERNAL_URL = "https://kubernetes.default.svc"
   val DEFAULT_DRIVER_CONTAINER_NAME = "spark-kubernetes-driver"
   val DEFAULT_EXECUTOR_CONTAINER_NAME = "spark-kubernetes-executor"

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

@@ -23,7 +23,7 @@ import io.fabric8.kubernetes.api.model._
 
 import org.apache.spark.deploy.k8s._
 import org.apache.spark.deploy.k8s.Config.KUBERNETES_USE_LEGACY_PVC_ACCESS_MODE
-import org.apache.spark.deploy.k8s.Constants.{ENV_EXECUTOR_ID, SPARK_APP_ID_LABEL}
+import org.apache.spark.deploy.k8s.Constants.{ENV_EXECUTOR_ID, PVC_ACCESS_MODE, SPARK_APP_ID_LABEL}
 
 private[spark] class MountVolumesFeatureStep(conf: KubernetesConf)
   extends KubernetesFeatureConfigStep {
@@ -142,5 +142,4 @@ private[spark] object MountVolumesFeatureStep {
   val PVC_ON_DEMAND = "OnDemand"
   val PVC = "PersistentVolumeClaim"
   val PVC_POSTFIX = "-pvc"
-  val PVC_ACCESS_MODE = "ReadWriteOncePod"
 }