Github user vanzin commented on a diff in the pull request:
https://github.com/apache/spark/pull/19954#discussion_r157324021
--- Diff:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/rest/k8s/KubernetesSparkDependencyDownloadInitContainer.scala
---
@@ -0,0 +1,129 @@
+/*
+ * 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.deploy.rest.k8s
+
+import java.io.File
+import java.util.concurrent.TimeUnit
+
+import scala.concurrent.{ExecutionContext, Future}
+import scala.concurrent.duration.Duration
+
+import org.apache.spark.{SecurityManager => SparkSecurityManager,
SparkConf}
+import org.apache.spark.deploy.SparkHadoopUtil
+import org.apache.spark.deploy.k8s.Config._
+import org.apache.spark.internal.Logging
+import org.apache.spark.util.{ThreadUtils, Utils}
+
+/**
+ * Process that fetches files from a resource staging server and/or
arbitrary remote locations.
+ *
+ * The init-container can handle fetching files from any of those sources,
but not all of the
+ * sources need to be specified. This allows for composing multiple
instances of this container
+ * with different configurations for different download sources, or using
the same container to
+ * download everything at once.
+ */
+private[spark] class KubernetesSparkDependencyDownloadInitContainer(
--- End diff --
This name is so long it becomes confusing. How about
`KubernetesInitContainer`? Or do you plan to have multiple different init
containers for different things (ugh)?
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