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Retry the submit-application request to multiple nodes (apache#69)
* Retry the submit-application request to multiple nodes. * Fix doc style comment * Check node unschedulable, log retry failures
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67 changes: 67 additions & 0 deletions
67
.../core/src/main/scala/org/apache/spark/deploy/rest/kubernetes/MultiServerFeignTarget.scala
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| /* | ||
| * 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.rest.kubernetes | ||
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| import feign.{Request, RequestTemplate, RetryableException, Retryer, Target} | ||
| import scala.reflect.ClassTag | ||
| import scala.util.Random | ||
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| private[kubernetes] class MultiServerFeignTarget[T : ClassTag]( | ||
| private val servers: Seq[String]) extends Target[T] with Retryer { | ||
| require(servers.nonEmpty, "Must provide at least one server URI.") | ||
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| private val threadLocalShuffledServers = new ThreadLocal[Seq[String]] { | ||
| override def initialValue(): Seq[String] = Random.shuffle(servers) | ||
| } | ||
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| override def `type`(): Class[T] = { | ||
| implicitly[ClassTag[T]].runtimeClass.asInstanceOf[Class[T]] | ||
| } | ||
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| override def url(): String = threadLocalShuffledServers.get.head | ||
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| /** | ||
| * Cloning the target is done on every request, for use on the current | ||
| * thread - thus it's important that clone returns a "fresh" target. | ||
| */ | ||
| override def clone(): Retryer = { | ||
| reset() | ||
| this | ||
| } | ||
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| override def name(): String = { | ||
| s"${getClass.getSimpleName} with servers [${servers.mkString(",")}]" | ||
| } | ||
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| override def apply(requestTemplate: RequestTemplate): Request = { | ||
| if (!requestTemplate.url().startsWith("http")) { | ||
| requestTemplate.insert(0, url()) | ||
| } | ||
| requestTemplate.request() | ||
| } | ||
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| override def continueOrPropagate(e: RetryableException): Unit = { | ||
| threadLocalShuffledServers.set(threadLocalShuffledServers.get.drop(1)) | ||
| if (threadLocalShuffledServers.get.isEmpty) { | ||
| throw e | ||
| } | ||
| } | ||
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| def reset(): Unit = { | ||
| threadLocalShuffledServers.set(Random.shuffle(servers)) | ||
| } | ||
| } |
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