Address comments

resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/kubernetes/Client.scala

@@ -64,17 +64,17 @@ private[spark] class Client(
     .getOrElse(Array.empty[String])
 
   // Memory settings
-  private val driverMemory = sparkConf.get("spark.driver.memory", "1g")
-  private val driverMemoryBytes = Utils.byteStringAsBytes(driverMemory)
-  private val driverSubmitServerMemory = sparkConf.get(KUBERNETES_DRIVER_SUBMIT_SERVER_MEMORY)
-  private val driverSubmitServerMemoryBytes = Utils.byteStringAsBytes(driverSubmitServerMemoryBytes)
-  private val driverContainerMemoryBytes = driverMemoryBytes + driverSubmitServerMemoryBytes
-  private val memoryOverheadBytes = sparkConf
+  private val driverMemoryMb = sparkConf.get(org.apache.spark.internal.config.DRIVER_MEMORY)
+  private val driverSubmitServerMemoryMb = sparkConf.get(KUBERNETES_DRIVER_SUBMIT_SERVER_MEMORY)
+  private val driverSubmitServerMemoryString = sparkConf.get(
+    KUBERNETES_DRIVER_SUBMIT_SERVER_MEMORY.key,
+    KUBERNETES_DRIVER_SUBMIT_SERVER_MEMORY.defaultValueString)
+  private val driverContainerMemoryMb = driverMemoryMb + driverSubmitServerMemoryMb
+  private val memoryOverheadMb = sparkConf
     .get(KUBERNETES_DRIVER_MEMORY_OVERHEAD)
-    .map(overhead => Utils.byteStringAsBytes(overhead))
-    .getOrElse(math.max((MEMORY_OVERHEAD_FACTOR * driverContainerMemoryBytes).toInt,
+    .getOrElse(math.max((MEMORY_OVERHEAD_FACTOR * driverContainerMemoryMb).toInt,
       MEMORY_OVERHEAD_MIN))
-  private val driverContainerMemoryWithOverhead = driverContainerMemoryBytes + memoryOverheadBytes
+  private val driverContainerMemoryWithOverhead = driverContainerMemoryMb + memoryOverheadMb
 
   private val waitForAppCompletion: Boolean = sparkConf.get(WAIT_FOR_APP_COMPLETION)
 
@@ -387,10 +387,10 @@ private[spark] class Client(
       .withNewPort(SUBMISSION_SERVER_PORT_NAME)
       .build()
     val driverMemoryQuantity = new QuantityBuilder(false)
-      .withAmount(driverContainerMemoryBytes.toString)
+      .withAmount(s"${driverContainerMemoryMb}M")
       .build()
     val driverMemoryLimitQuantity = new QuantityBuilder(false)
-      .withAmount(driverContainerMemoryWithOverhead.toString)
+      .withAmount(s"${driverContainerMemoryWithOverhead}M")
       .build()
     kubernetesClient.pods().createNew()
       .withNewMetadata()
@@ -428,7 +428,7 @@ private[spark] class Client(
           // Note that SPARK_DRIVER_MEMORY only affects the REST server via spark-class.
           .addNewEnv()
             .withName(ENV_DRIVER_MEMORY)
-            .withValue(driverSubmitServerMemory)
+            .withValue(driverSubmitServerMemoryString)
             .endEnv()
           .addToEnv(sslConfiguration.sslPodEnvVars: _*)
           .withNewResources()

resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/kubernetes/config.scala

@@ -20,6 +20,7 @@ import java.util.concurrent.TimeUnit
 
 import org.apache.spark.{SPARK_VERSION => sparkVersion}
 import org.apache.spark.internal.config.ConfigBuilder
+import org.apache.spark.network.util.ByteUnit
 
 package object config {
 
@@ -103,7 +104,7 @@ package object config {
           | overheads, etc. This tends to grow with the executor size
           | (typically 6-10%).
         """.stripMargin)
-      .stringConf
+      .bytesConf(ByteUnit.MiB)
       .createOptional
 
   private[spark] val KUBERNETES_DRIVER_MEMORY_OVERHEAD =
@@ -115,7 +116,7 @@ package object config {
           | interned strings, other native overheads, etc. This tends
           | to grow with the driver's memory size (typically 6-10%).
            """.stripMargin)
-      .stringConf
+      .bytesConf(ByteUnit.MiB)
       .createOptional
 
   private[spark] val KUBERNETES_DRIVER_LABELS =
@@ -173,8 +174,8 @@ package object config {
       .doc("""
           | The amount of memory to allocate for the driver submission server.
         """.stripMargin)
-      .stringConf
-      .createWithDefault("256m")
+      .bytesConf(ByteUnit.MiB)
+      .createWithDefaultString("256m")
 
   private[spark] val EXPOSE_KUBERNETES_DRIVER_SERVICE_UI_PORT =
     ConfigBuilder("spark.kubernetes.driver.service.exposeUiPort")

resource-managers/kubernetes/core/src/main/scala/org/apache/spark/scheduler/cluster/kubernetes/KubernetesClusterSchedulerBackend.scala

@@ -60,15 +60,16 @@ private[spark] class KubernetesClusterSchedulerBackend(
     .getOrElse(
       throw new SparkException("Must specify the driver pod name"))
 
-  private val executorMemory = conf.get("spark.executor.memory", "1g")
-  private val executorMemoryBytes = Utils.byteStringAsBytes(executorMemory)
+  private val executorMemoryMb = conf.get(org.apache.spark.internal.config.EXECUTOR_MEMORY)
+  private val executorMemoryString = conf.get(
+    org.apache.spark.internal.config.EXECUTOR_MEMORY.key,
+    org.apache.spark.internal.config.EXECUTOR_MEMORY.defaultValueString)
 
-  private val memoryOverheadBytes = conf
+  private val memoryOverheadMb = conf
     .get(KUBERNETES_EXECUTOR_MEMORY_OVERHEAD)
-    .map(overhead => Utils.byteStringAsBytes(overhead))
-    .getOrElse(math.max((MEMORY_OVERHEAD_FACTOR * executorMemoryBytes).toInt,
+    .getOrElse(math.max((MEMORY_OVERHEAD_FACTOR * executorMemoryMb).toInt,
       MEMORY_OVERHEAD_MIN))
-  private val executorMemoryWithOverhead = executorMemoryBytes + memoryOverheadBytes
+  private val executorMemoryWithOverhead = executorMemoryMb + memoryOverheadMb
 
   private val executorCores = conf.getOption("spark.executor.cores").getOrElse("1")
 
@@ -165,10 +166,10 @@ private[spark] class KubernetesClusterSchedulerBackend(
     val selectors = Map(SPARK_EXECUTOR_ID_LABEL -> executorId,
       SPARK_APP_ID_LABEL -> applicationId()).asJava
     val executorMemoryQuantity = new QuantityBuilder(false)
-      .withAmount(executorMemoryBytes.toString)
+      .withAmount(s"${executorMemoryMb}M")
       .build()
     val executorMemoryLimitQuantity = new QuantityBuilder(false)
-      .withAmount(executorMemoryWithOverhead.toString)
+      .withAmount(s"${executorMemoryWithOverhead}M")
       .build()
     val executorCpuQuantity = new QuantityBuilder(false)
       .withAmount(executorCores)
@@ -177,7 +178,7 @@ private[spark] class KubernetesClusterSchedulerBackend(
       (ENV_EXECUTOR_PORT, executorPort.toString),
       (ENV_DRIVER_URL, driverUrl),
       (ENV_EXECUTOR_CORES, executorCores),
-      (ENV_EXECUTOR_MEMORY, executorMemory),
+      (ENV_EXECUTOR_MEMORY, executorMemoryString),
       (ENV_APPLICATION_ID, applicationId()),
       (ENV_EXECUTOR_ID, executorId)
     ).map(env => new EnvVarBuilder()