Config for hard cpu limit on pods; default unlimited (apache#356)

Author: sandflee

docs/running-on-kubernetes.md

@@ -718,6 +718,20 @@ from the other deployment modes. See the [configuration page](configuration.html
     Docker image pull policy used when pulling Docker images with Kubernetes.
   </td>
 </tr>
+<tr>
+  <td><code>spark.kubernetes.driver.limit.cores</code></td>
+  <td>(none)</td>
+  <td>
+    Specify the hard cpu limit for the driver pod
+  </td>
+</tr>
+<tr>
+  <td><code>spark.kubernetes.executor.limit.cores</code></td>
+  <td>(none)</td>
+  <td>
+    Specify the hard cpu limit for a single executor pod
+  </td>
+</tr>
 </table>
 
 

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

@@ -485,6 +485,18 @@ package object config extends Logging {
       .stringConf
       .createOptional
 
+  private[spark] val KUBERNETES_DRIVER_LIMIT_CORES =
+    ConfigBuilder("spark.kubernetes.driver.limit.cores")
+      .doc("Specify the hard cpu limit for the driver pod")
+      .stringConf
+      .createOptional
+
+  private[spark] val KUBERNETES_EXECUTOR_LIMIT_CORES =
+    ConfigBuilder("spark.kubernetes.executor.limit.cores")
+      .doc("Specify the hard cpu limit for a single executor pod")
+      .stringConf
+      .createOptional
+
   private[spark] def resolveK8sMaster(rawMasterString: String): String = {
     if (!rawMasterString.startsWith("k8s://")) {
       throw new IllegalArgumentException("Master URL should start with k8s:// in Kubernetes mode.")

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

@@ -64,6 +64,7 @@ private[spark] class Client(
 
   // CPU settings
   private val driverCpuCores = sparkConf.getOption("spark.driver.cores").getOrElse("1")
+  private val driverLimitCores = sparkConf.getOption(KUBERNETES_DRIVER_LIMIT_CORES.key)
 
   // Memory settings
   private val driverMemoryMb = sparkConf.get(org.apache.spark.internal.config.DRIVER_MEMORY)
@@ -139,7 +140,6 @@ private[spark] class Client(
         .endEnv()
       .withNewResources()
         .addToRequests("cpu", driverCpuQuantity)
-        .addToLimits("cpu", driverCpuQuantity)
         .addToRequests("memory", driverMemoryQuantity)
         .addToLimits("memory", driverMemoryLimitQuantity)
         .endResources()
@@ -156,6 +156,21 @@ private[spark] class Client(
         .addToContainers(driverContainer)
         .endSpec()
 
+    driverLimitCores.map {
+      limitCores =>
+        val driverCpuLimitQuantity = new QuantityBuilder(false)
+          .withAmount(limitCores)
+          .build()
+        basePod
+          .editSpec()
+            .editFirstContainer()
+              .editResources
+                .addToLimits("cpu", driverCpuLimitQuantity)
+              .endResources()
+            .endContainer()
+          .endSpec()
+    }
+
     val maybeSubmittedResourceIdentifiers = initContainerComponentsProvider
       .provideInitContainerSubmittedDependencyUploader(allDriverLabels)
       .map { uploader =>

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

@@ -108,6 +108,7 @@ private[spark] class KubernetesClusterSchedulerBackend(
   private val executorMemoryWithOverhead = executorMemoryMb + memoryOverheadMb
 
   private val executorCores = conf.getOption("spark.executor.cores").getOrElse("1")
+  private val executorLimitCores = conf.getOption(KUBERNETES_EXECUTOR_LIMIT_CORES.key)
 
   private implicit val requestExecutorContext = ExecutionContext.fromExecutorService(
     ThreadUtils.newDaemonCachedThreadPool("kubernetes-executor-requests"))
@@ -438,14 +439,28 @@ private[spark] class KubernetesClusterSchedulerBackend(
             .addToRequests("memory", executorMemoryQuantity)
             .addToLimits("memory", executorMemoryLimitQuantity)
             .addToRequests("cpu", executorCpuQuantity)
-            .addToLimits("cpu", executorCpuQuantity)
           .endResources()
           .addAllToEnv(requiredEnv.asJava)
           .addToEnv(executorExtraClasspathEnv.toSeq: _*)
           .withPorts(requiredPorts.asJava)
         .endContainer()
       .endSpec()
 
+    executorLimitCores.map {
+      limitCores =>
+        val executorCpuLimitQuantity = new QuantityBuilder(false)
+          .withAmount(limitCores)
+          .build()
+        basePodBuilder
+          .editSpec()
+            .editFirstContainer()
+              .editResources
+                .addToLimits("cpu", executorCpuLimitQuantity)
+              .endResources()
+            .endContainer()
+          .endSpec()
+    }
+
     val withMaybeShuffleConfigPodBuilder = shuffleServiceConfig
       .map { config =>
         config.shuffleDirs.foldLeft(basePodBuilder) { (builder, dir) =>