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Introduce blocking submit to kubernetes by default (apache#53)
* Introduce blocking submit to kubernetes by default Two new configuration settings: - spark.kubernetes.submit.waitAppCompletion - spark.kubernetes.report.interval * Minor touchups * More succinct logging for pod state * Fix import order * Switch to watch-based logging * Spaces in comma-joined volumes, labels, and containers * Use CountDownLatch instead of SettableFuture * Match parallel ConfigBuilder style * Disable logging in fire-and-forget mode Which is enabled with spark.kubernetes.submit.waitAppCompletion=false (default: true) * Additional log line for when application is launched * Minor wording changes * More logging * Drop log to DEBUG
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...etes/core/src/main/scala/org/apache/spark/deploy/kubernetes/LoggingPodStatusWatcher.scala
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| /* | ||
| * 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.kubernetes | ||
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| import java.util.concurrent.{CountDownLatch, Executors, TimeUnit} | ||
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| import scala.collection.JavaConverters._ | ||
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| import io.fabric8.kubernetes.api.model.Pod | ||
| import io.fabric8.kubernetes.client.{KubernetesClientException, Watcher} | ||
| import io.fabric8.kubernetes.client.Watcher.Action | ||
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| import org.apache.spark.internal.Logging | ||
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| /** | ||
| * A monitor for the running Kubernetes pod of a Spark application. Status logging occurs on | ||
| * every state change and also at an interval for liveness. | ||
| * | ||
| * @param podCompletedFuture a CountDownLatch that is set to true when the watched pod finishes | ||
| * @param appId | ||
| * @param interval ms between each state request. If set to 0 or a negative number, the periodic | ||
| * logging will be disabled. | ||
| */ | ||
| private[kubernetes] class LoggingPodStatusWatcher(podCompletedFuture: CountDownLatch, | ||
| appId: String, | ||
| interval: Long) | ||
| extends Watcher[Pod] with Logging { | ||
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| // start timer for periodic logging | ||
| private val scheduler = Executors.newScheduledThreadPool(1) | ||
| private val logRunnable: Runnable = new Runnable { | ||
| override def run() = logShortStatus() | ||
| } | ||
| if (interval > 0) { | ||
| scheduler.scheduleWithFixedDelay(logRunnable, 0, interval, TimeUnit.MILLISECONDS) | ||
| } | ||
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| private var pod: Option[Pod] = Option.empty | ||
| private var prevPhase: String = null | ||
| private def phase: String = pod.map(_.getStatus().getPhase()).getOrElse("unknown") | ||
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| override def eventReceived(action: Action, pod: Pod): Unit = { | ||
| this.pod = Option(pod) | ||
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| logShortStatus() | ||
| if (prevPhase != phase) { | ||
| logLongStatus() | ||
| } | ||
| prevPhase = phase | ||
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| if (phase == "Succeeded" || phase == "Failed") { | ||
| podCompletedFuture.countDown() | ||
| } | ||
| } | ||
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| override def onClose(e: KubernetesClientException): Unit = { | ||
| scheduler.shutdown() | ||
| logDebug(s"Stopped watching application $appId with last-observed phase $phase") | ||
| } | ||
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| private def logShortStatus() = { | ||
| logInfo(s"Application status for $appId (phase: $phase)") | ||
| } | ||
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| private def logLongStatus() = { | ||
| logInfo("Phase changed, new state: " + pod.map(formatPodState(_)).getOrElse("unknown")) | ||
| } | ||
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| private def formatPodState(pod: Pod): String = { | ||
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| val details = Seq[(String, String)]( | ||
| // pod metadata | ||
| ("pod name", pod.getMetadata.getName()), | ||
| ("namespace", pod.getMetadata.getNamespace()), | ||
| ("labels", pod.getMetadata.getLabels().asScala.mkString(", ")), | ||
| ("pod uid", pod.getMetadata.getUid), | ||
| ("creation time", pod.getMetadata.getCreationTimestamp()), | ||
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| // spec details | ||
| ("service account name", pod.getSpec.getServiceAccountName()), | ||
| ("volumes", pod.getSpec.getVolumes().asScala.map(_.getName).mkString(", ")), | ||
| ("node name", pod.getSpec.getNodeName()), | ||
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| // status | ||
| ("start time", pod.getStatus.getStartTime), | ||
| ("container images", | ||
| pod.getStatus.getContainerStatuses() | ||
| .asScala | ||
| .map(_.getImage) | ||
| .mkString(", ")), | ||
| ("phase", pod.getStatus.getPhase()) | ||
| ) | ||
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| // Use more loggable format if value is null or empty | ||
| details.map { case (k, v) => | ||
| val newValue = Option(v).filter(_.nonEmpty).getOrElse("N/A") | ||
| s"\n\t $k: $newValue" | ||
| }.mkString("") | ||
| } | ||
| } |
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