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[SPARK-27754][K8S] Introduce additional config (spark.kubernetes.driver.request.cores) for driver request cores for spark on k8s #24630

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[SPARK-27754][K8S] Introduce additional config (spark.kubernetes.driver.request.cores) for driver request cores for spark on k8s #24630

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4002b74
Introduce config for driver request cores
arunmahadevan May 16, 2019
8ca63d3
review comments and test case
arunmahadevan May 17, 2019
ff688c2
fix default value
arunmahadevan May 18, 2019
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9 changes: 9 additions & 0 deletions docs/running-on-kubernetes.md
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Original file line number Diff line number Diff line change
Expand Up @@ -793,6 +793,15 @@ See the [configuration page](configuration.html) for information on Spark config
Interval between reports of the current Spark job status in cluster mode.
</td>
</tr>
<tr>
<td><code>spark.kubernetes.driver.request.cores</code></td>
<td>(none)</td>
<td>
Specify the cpu request for the driver pod. Values conform to the Kubernetes <a href="https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/#meaning-of-cpu">convention</a>.
Example values include 0.1, 500m, 1.5, 5, etc., with the definition of cpu units documented in <a href="https://kubernetes.io/docs/tasks/configure-pod-container/assign-cpu-resource/#cpu-units">CPU units</a>.
This takes precedence over <code>spark.driver.cores</code> for specifying the driver pod cpu request if set.
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</td>
</tr>
<tr>
<td><code>spark.kubernetes.driver.limit.cores</code></td>
<td>(none)</td>
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6 changes: 6 additions & 0 deletions resource-managers/kubernetes/core/src/main/scala/org/apache/spark/deploy/k8s/Config.scala
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Expand Up @@ -125,6 +125,12 @@ private[spark] object Config extends Logging {
.stringConf
.createOptional

val KUBERNETES_DRIVER_REQUEST_CORES =
ConfigBuilder("spark.kubernetes.driver.request.cores")
.doc("Specify the cpu request for the driver pod")
.stringConf
.createOptional

val KUBERNETES_DRIVER_SUBMIT_CHECK =
ConfigBuilder("spark.kubernetes.submitInDriver")
.internal()
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7 changes: 5 additions & 2 deletions ...tes/core/src/main/scala/org/apache/spark/deploy/k8s/features/BasicDriverFeatureStep.scala
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Expand Up @@ -43,7 +43,10 @@ private[spark] class BasicDriverFeatureStep(conf: KubernetesDriverConf)
.getOrElse(throw new SparkException("Must specify the driver container image"))

// CPU settings
private val driverCpuCores = conf.get(DRIVER_CORES.key, "1")
private val driverCpuCores = conf.get(DRIVER_CORES)
private val driverCoresRequest = conf
.get(KUBERNETES_DRIVER_REQUEST_CORES)
.getOrElse(driverCpuCores.toString)
private val driverLimitCores = conf.get(KUBERNETES_DRIVER_LIMIT_CORES)

// Memory settings
Expand Down Expand Up @@ -77,7 +80,7 @@ private[spark] class BasicDriverFeatureStep(conf: KubernetesDriverConf)
}

val driverCpuQuantity = new QuantityBuilder(false)
.withAmount(driverCpuCores)
.withAmount(driverCoresRequest)
.build()
val driverMemoryQuantity = new QuantityBuilder(false)
.withAmount(s"${driverMemoryWithOverheadMiB}Mi")
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32 changes: 32 additions & 0 deletions ...ore/src/test/scala/org/apache/spark/deploy/k8s/features/BasicDriverFeatureStepSuite.scala
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Expand Up @@ -117,6 +117,38 @@ class BasicDriverFeatureStepSuite extends SparkFunSuite {
assert(featureStep.getAdditionalPodSystemProperties() === expectedSparkConf)
}

test("Check driver pod respects kubernetes driver request cores") {
val sparkConf = new SparkConf()
.set(KUBERNETES_DRIVER_POD_NAME, "spark-driver-pod")
.set(CONTAINER_IMAGE, "spark-driver:latest")

val basePod = SparkPod.initialPod()
// if spark.driver.cores is not set default is 1
val requests1 = new BasicDriverFeatureStep(KubernetesTestConf.createDriverConf(sparkConf))
.configurePod(basePod)
.container.getResources
.getRequests.asScala
assert(requests1("cpu").getAmount === "1")
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Can we avoid this assumption? You had better get the default value of DRIVER_CORES and compare with that.

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IIUC, as per the existing logic the default value would be "1" if spark.driver.cores is not set and not the default value of spark.driver.cores which also happens to be 1. I did not want to change that logic.

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@arunmahadevan . What I meant was this constant assertion, === "1". If we change the default value of that configuration, this test will fails. We had better get and use the default value from the conf.

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@dongjoon-hyun , the logic in BasicDriverFeatureStep
private val driverCpuCores = conf.get(DRIVER_CORES.key, "1")
, sets the value of driverCpuCores to "1" if spark.driver.cores is not set in the spark conf. i.e. we don't use the DRIVER_CORES.defaultValue there. Let me know if my understanding is correct.
If so I cannot do something like assert(requests1("cpu").getAmount === DRIVER_CORES.defaultValue) here (assume this is what you are suggesting).

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That should be the following because we should not have a magic number in the code.

-  private val driverCpuCores = conf.get(DRIVER_CORES.key, "1")
+  private val driverCpuCores = conf.get(DRIVER_CORES)
     val driverCpuQuantity = new QuantityBuilder(false)
-      .withAmount(driverCpuCores)
+      .withAmount(driverCpuCores.toString)

Please fix like the above. And don't use magic numbers.

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updated.


// if spark.driver.cores is set it should be used
sparkConf.set(DRIVER_CORES, 10)
val requests2 = new BasicDriverFeatureStep(KubernetesTestConf.createDriverConf(sparkConf))
.configurePod(basePod)
.container.getResources
.getRequests.asScala
assert(requests2("cpu").getAmount === "10")

// spark.kubernetes.driver.request.cores should be preferred over spark.driver.cores
Seq("0.1", "100m").foreach { value =>
sparkConf.set(KUBERNETES_DRIVER_REQUEST_CORES, value)
val requests3 = new BasicDriverFeatureStep(KubernetesTestConf.createDriverConf(sparkConf))
.configurePod(basePod)
.container.getResources
.getRequests.asScala
assert(requests3("cpu").getAmount === value)
}
}

test("Check appropriate entrypoint rerouting for various bindings") {
val javaSparkConf = new SparkConf()
.set(DRIVER_MEMORY.key, "4g")
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