dongjoon-hyun commented on a change in pull request #35345:
URL: https://github.com/apache/spark/pull/35345#discussion_r797337809



##########
File path: 
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/features/KubernetesFeatureConfigStep.scala
##########
@@ -19,7 +19,43 @@ package org.apache.spark.deploy.k8s.features
 import io.fabric8.kubernetes.api.model.HasMetadata
 
 import org.apache.spark.annotation.{DeveloperApi, Unstable}
-import org.apache.spark.deploy.k8s.SparkPod
+import org.apache.spark.deploy.k8s.{KubernetesDriverConf, 
KubernetesExecutorConf, SparkPod}
+
+/**
+ * :: DeveloperApi ::
+ *
+ * A base interface to help user extend custom feature step in driver side.
+ * Note: If your custom feature step would be used only in driver or both in 
driver and executor,
+ * please use this.
+ */
+@Unstable
+@DeveloperApi
+trait KubernetesDriverCustomFeatureConfigStep extends 
KubernetesFeatureConfigStep {

Review comment:
       Please make separate files for `KubernetesDriverCustomFeatureConfigStep` 
and `KubernetesExecutorCustomFeatureConfigStep`. It's okay in this case.




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