refactor

Author: turboFei

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

@@ -22,8 +22,12 @@ import io.fabric8.kubernetes.api.model.{ContainerBuilder, PodBuilder, VolumeBuil
 import org.apache.spark.deploy.k8s.{KubernetesConf, SparkPod}
 import org.apache.spark.deploy.k8s.Constants._
 
-class HadoopConfExecutorFeatureStep (conf: KubernetesConf)
+/**
+ * Mounts the Hadoop configuration on the executor pod.
+ */
+private[spark] class HadoopConfExecutorFeatureStep(conf: KubernetesConf)
   extends KubernetesFeatureConfigStep {
+
   override def configurePod(pod: SparkPod): SparkPod = {
     conf.getOption(HADOOP_CONFIG_MAP_NAME) match {
       case Some(hadoopConfigMap) =>

resource-managers/kubernetes/core/src/test/scala/org/apache/spark/deploy/k8s/features/HadoopConfExecutorFeatureStepSuite.scala

@@ -31,7 +31,7 @@ import org.apache.spark.util.{SparkConfWithEnv, Utils}
 class HadoopConfExecutorFeatureStepSuite extends SparkFunSuite  {
   import SecretVolumeUtils._
 
-  test("SPARK-43504: mount hadoop config map in executor side") {
+  test("SPARK-43504: mounts the hadoop config map on the executor pod") {
     val confDir = Utils.createTempDir()
     val confFiles = Set("core-site.xml", "hdfs-site.xml")