dongjoon-hyun commented on code in PR #51396:
URL: https://github.com/apache/spark/pull/51396#discussion_r2299613211


##########
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/k8s/ExecutorPodsInformerCustomSnapshotSource.scala:
##########
@@ -0,0 +1,31 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.scheduler.cluster.k8s
+
+import io.fabric8.kubernetes.client.KubernetesClient
+
+import org.apache.spark.SparkConf
+import org.apache.spark.annotation.{DeveloperApi, Unstable}
+
+@Unstable
+@DeveloperApi
+abstract class ExecutorPodsInformerCustomSnapshotSource extends 
ExecutorPodsSnapshotSource {
+  def init(sparkConf: SparkConf, kubernetesClient: KubernetesClient,
+           snapshotStore: ExecutorPodsSnapshotsStore,

Review Comment:
   Indentation? We don't use a vertical alignment.
   
   Since this PR aim to contribute several files, I'd like to recommend you to 
read a community `Code style guide` to follow the style of the existing 
codebase.
   
   - https://spark.apache.org/contributing.html
   
   > For Scala code, Apache Spark follows the official [Scala style 
guide](http://docs.scala-lang.org/style/) and [Databricks Scala 
guide](https://github.com/databricks/scala-style-guide). The latter is 
preferred.



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