Github user liyinan926 commented on a diff in the pull request:
https://github.com/apache/spark/pull/19954#discussion_r157327539
--- 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(
+ sparkConf: SparkConf,
+ fileFetcher: FileFetcher) extends Logging {
+
+ private implicit val downloadExecutor =
ExecutionContext.fromExecutorService(
+ ThreadUtils.newDaemonCachedThreadPool("download-executor"))
+
+ private val jarsDownloadDir = new File(
+ sparkConf.get(JARS_DOWNLOAD_LOCATION))
+ private val filesDownloadDir = new File(
+ sparkConf.get(FILES_DOWNLOAD_LOCATION))
+
+ private val remoteJars = sparkConf.get(INIT_CONTAINER_REMOTE_JARS)
+ private val remoteFiles = sparkConf.get(INIT_CONTAINER_REMOTE_FILES)
+
+ private val downloadTimeoutMinutes =
sparkConf.get(INIT_CONTAINER_MOUNT_TIMEOUT)
+
+ def run(): Unit = {
+ val remoteJarsDownload = Future[Unit] {
+ logInfo(s"Downloading remote jars: $remoteJars")
+ downloadFiles(
+ remoteJars,
+ jarsDownloadDir,
+ s"Remote jars download directory specified at $jarsDownloadDir
does not exist " +
+ "or is not a directory.")
+ }
+ val remoteFilesDownload = Future[Unit] {
+ logInfo(s"Downloading remote files: $remoteFiles")
+ downloadFiles(
+ remoteFiles,
+ filesDownloadDir,
+ s"Remote files download directory specified at $filesDownloadDir
does not exist " +
+ "or is not a directory.")
+ }
+ waitForFutures(
--- End diff --
This class actually handles more tasks in our fork. For example, is is also
responsible for downloading from the resource staging server that hosts
submission client dependencies. The resource staging server will be in a future
PR.
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