Github user liyinan926 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22959#discussion_r234775406
  
    --- Diff: 
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/KerberosConfDriverFeatureStep.scala
 ---
    @@ -16,40 +16,45 @@
      */
     package org.apache.spark.deploy.k8s.features
     
    -import io.fabric8.kubernetes.api.model.HasMetadata
    +import io.fabric8.kubernetes.api.model.{HasMetadata, Secret, SecretBuilder}
    +import org.apache.commons.codec.binary.Base64
    +import org.apache.hadoop.security.{Credentials, UserGroupInformation}
     
     import org.apache.spark.deploy.SparkHadoopUtil
    -import org.apache.spark.deploy.k8s.{KubernetesConf, KubernetesUtils, 
SparkPod}
    +import org.apache.spark.deploy.k8s.{KubernetesDriverConf, KubernetesUtils, 
SparkPod}
     import org.apache.spark.deploy.k8s.Config._
     import org.apache.spark.deploy.k8s.Constants._
    -import org.apache.spark.deploy.k8s.KubernetesDriverSpecificConf
     import org.apache.spark.deploy.k8s.features.hadooputils._
    -import org.apache.spark.internal.Logging
    +import org.apache.spark.deploy.security.HadoopDelegationTokenManager
     
     /**
      * Runs the necessary Hadoop-based logic based on Kerberos configs and the 
presence of the
      * HADOOP_CONF_DIR. This runs various bootstrap methods defined in 
HadoopBootstrapUtil.
      */
    -private[spark] class KerberosConfDriverFeatureStep(
    -    kubernetesConf: KubernetesConf[KubernetesDriverSpecificConf])
    -  extends KubernetesFeatureConfigStep with Logging {
    +private[spark] class KerberosConfDriverFeatureStep(kubernetesConf: 
KubernetesDriverConf)
    +  extends KubernetesFeatureConfigStep {
     
    -  require(kubernetesConf.hadoopConfSpec.isDefined,
    -     "Ensure that HADOOP_CONF_DIR is defined either via env or a 
pre-defined ConfigMap")
    -  private val hadoopConfDirSpec = kubernetesConf.hadoopConfSpec.get
       private val conf = kubernetesConf.sparkConf
    --- End diff --
    
    Is `conf` still needed?


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