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[SPARK-24894][k8s] Make sure valid host names are created for executors. #23781

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[SPARK-24894][k8s] Make sure valid host names are created for executors. #23781

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5 changes: 5 additions & 0 deletions ...s/core/src/main/scala/org/apache/spark/deploy/k8s/features/BasicExecutorFeatureStep.scala
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Expand Up @@ -83,6 +83,11 @@ private[spark] class BasicExecutorFeatureStep(
// name as the hostname. This preserves uniqueness since the end of name contains
// executorId
val hostname = name.substring(Math.max(0, name.length - 63))
// Remove non-word characters from the start of the hostname
.replaceAll("^[^\\w]+", "")
// Replace dangerous characters in the remaining string with a safe alternative.
.replaceAll("[^\\w-]+", "_")

val executorMemoryQuantity = new QuantityBuilder(false)
.withAmount(s"${executorMemoryTotal}Mi")
.build()
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11 changes: 11 additions & 0 deletions ...e/src/test/scala/org/apache/spark/deploy/k8s/features/BasicExecutorFeatureStepSuite.scala
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Expand Up @@ -22,6 +22,7 @@ import java.nio.file.Files

import scala.collection.JavaConverters._

import com.google.common.net.InternetDomainName
import io.fabric8.kubernetes.api.model._
import org.scalatest.BeforeAndAfter

Expand Down Expand Up @@ -124,6 +125,16 @@ class BasicExecutorFeatureStepSuite extends SparkFunSuite with BeforeAndAfter {
assert(step.configurePod(SparkPod.initialPod()).pod.getSpec.getHostname.length === 63)
}

test("hostname truncation generates valid host names") {
val invalidPrefix = "abcdef-*_/[]{}+==.,;'\"-----------------------------------------------"

baseConf.set(KUBERNETES_EXECUTOR_POD_NAME_PREFIX, invalidPrefix)
val step = new BasicExecutorFeatureStep(newExecutorConf(), new SecurityManager(baseConf))
val hostname = step.configurePod(SparkPod.initialPod()).pod.getSpec().getHostname()
assert(hostname.length <= 63)
assert(InternetDomainName.isValid(hostname))
}

test("classpath and extra java options get translated into environment variables") {
baseConf.set(config.EXECUTOR_JAVA_OPTIONS, "foo=bar")
baseConf.set(config.EXECUTOR_CLASS_PATH, "bar=baz")
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