Github user liyinan926 commented on a diff in the pull request:
https://github.com/apache/spark/pull/21260#discussion_r194464996
--- Diff:
resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/KubernetesVolumeUtils.scala
---
@@ -0,0 +1,114 @@
+/*
+ * 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.k8s
+
+import java.util.NoSuchElementException
+
+import scala.util.{Failure, Success, Try}
+
+import org.apache.spark.SparkConf
+import org.apache.spark.deploy.k8s.Config._
+
+private[spark] object KubernetesVolumeUtils {
+ /**
+ * Extract Spark volume configuration properties with a given name
prefix.
+ *
+ * @param sparkConf Spark configuration
+ * @param prefix the given property name prefix
+ * @return a Map storing with volume name as key and spec as value
+ */
+ def parseVolumesWithPrefix(
+ sparkConf: SparkConf,
+ prefix: String): Iterable[Try[KubernetesVolumeSpec[_ <:
KubernetesVolumeSpecificConf]]] = {
+ val properties = sparkConf.getAllWithPrefix(prefix).toMap
+
+ getVolumeTypesAndNames(properties).map { case (volumeType, volumeName)
=>
+ val pathKey =
s"$volumeType.$volumeName.$KUBERNETES_VOLUMES_MOUNT_PATH_KEY"
+ val readOnlyKey =
s"$volumeType.$volumeName.$KUBERNETES_VOLUMES_MOUNT_READONLY_KEY"
+
+ for {
+ path <- properties.getTry(pathKey)
+ readOnly <- properties.getTry(readOnlyKey)
+ volumeConf <- parseVolumeSpecificConf(properties, volumeType,
volumeName)
+ } yield KubernetesVolumeSpec(
+ volumeName = volumeName,
+ mountPath = path,
+ mountReadOnly = readOnly.toBoolean,
+ volumeConf = volumeConf
+ )
+ }
+ }
+
+ /**
+ * Get unique pairs of volumeType and volumeName,
+ * assuming options are formatted in this way:
+ * `volumeType`.`volumeName`.`property` = `value`
+ * @param properties flat mapping of property names to values
+ * @return Set[(volumeType, volumeName)]
+ */
+ private def getVolumeTypesAndNames(
+ properties: Map[String, String]
+ ): Set[(String, String)] = {
+ properties.keys.flatMap { k =>
+ k.split('.').toList match {
+ case tpe :: name :: _ => Some((tpe, name))
+ case _ => None
+ }
+ }.toSet
+ }
+
+ private def parseVolumeSpecificConf(
+ options: Map[String, String],
+ volumeType: String,
+ volumeName: String): Try[KubernetesVolumeSpecificConf] = {
+ volumeType match {
+ case KUBERNETES_VOLUMES_HOSTPATH_TYPE =>
+ val pathKey =
s"$volumeType.$volumeName.$KUBERNETES_VOLUMES_OPTIONS_PATH_KEY"
+ for {
+ path <- options.getTry(pathKey)
+ } yield KubernetesHostPathVolumeConf(path)
+
+ case KUBERNETES_VOLUMES_PVC_TYPE =>
+ val claimNameKey =
s"$volumeType.$volumeName.$KUBERNETES_VOLUMES_OPTIONS_CLAIM_NAME_KEY"
+ for {
+ claimName <- options.getTry(claimNameKey)
+ } yield KubernetesPVCVolumeConf(claimName)
+
+ case KUBERNETES_VOLUMES_EMPTYDIR_TYPE =>
+ val mediumKey =
s"$volumeType.$volumeName.$KUBERNETES_VOLUMES_OPTIONS_MEDIUM_KEY"
+ val sizeLimitKey =
s"$volumeType.$volumeName.$KUBERNETES_VOLUMES_OPTIONS_SIZE_LIMIT_KEY"
+ for {
+ medium <- options.getTry(mediumKey)
+ sizeLimit <- options.getTry(sizeLimitKey)
--- End diff --
Both `Medium` and `SizeLimit` are optional for `EmptyDirVolumeSource` so
users are not required to set them. What happens with `options.getTry` if users
do not set the key?
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