Spark / Hadoop / Yarn集群通信需要外部ip吗？

时间：2015-06-26 16:36:24

标签： hadoop apache-spark yarn google-hadoop

我使用bdutil在Hadoop（2.6）集群上部署了带有yarn-client的Spark（1.3.1），默认情况下，使用Ephemeral外部ips创建实例，到目前为止spark工作正常。考虑到一些安全问题，并假设集群仅在内部访问，我从实例中删除了外部ips;之后，火花壳甚至不会运行，似乎它无法与Yarn / Hadoop通信，并且无限期地卡住了。只有在我添加外部ips之后，spark-shell才能正常工作。

我的问题是，是否需要在纱线上运行火花所需的外部节点，为什么？如果是，是否会对安全性等有任何顾虑？谢谢！

1 个答案:

答案 0 :(得分：1)

简答

您需要外部IP地址才能访问GCS，默认的bdutil设置将GCS设置为默认的Hadoop文件系统，包括控制文件。使用./bdutil -F hdfs ... deploy代替HDFS作为默认值。

使用外部IP地址时，安全性不应该成为一个问题，除非您在GCE网络配置中为防火墙规则添加了太多许可规则。

编辑：目前，即使default_fs是hdfs，我们也会将spark.eventLog.dir设置为GCS路径。我提交https://github.com/GoogleCloudPlatform/bdutil/issues/35来跟踪此事。在此期间，只需手动修改主版块上的/home/hadoop/spark-install/conf/spark-defaults.conf（您可能需要sudo -u hadoop vim.tiny /home/hadoop/spark-install/conf/spark-defaults.conf对其拥有编辑权限）才能将spark.eventLog.dir设置为hdfs:///spark-eventlog-base或HDFS中的其他内容，并运行hadoop fs -mkdir -p hdfs:///spark-eventlog-base以使其正常运行。

长答案

默认情况下，bdutil还会将Google云存储配置为＆＃34;默认的Hadoop文件系统＆＃34;，这意味着Spark和YARN使用的控制文件需要访问Google云端存储。此外，还需要外部IP才能访问Google云端存储。

手动配置网内SSH后，我确实设法部分重复了你的情况;在启动过程中我实际看到以下内容：

15/06/26 17:23:05 INFO yarn.Client: Preparing resources for our AM container
15/06/26 17:23:05 INFO gcs.GoogleHadoopFileSystemBase: GHFS version: 1.4.0-hadoop2
15/06/26 17:23:26 WARN http.HttpTransport: exception thrown while executing request
java.net.SocketTimeoutException: connect timed out
  at java.net.PlainSocketImpl.socketConnect(Native Method)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
  at java.net.Socket.connect(Socket.java:579)
  at sun.security.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:625)
  at sun.net.NetworkClient.doConnect(NetworkClient.java:175)
  at sun.net.www.http.HttpClient.openServer(HttpClient.java:432)
  at sun.net.www.http.HttpClient.openServer(HttpClient.java:527)
  at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:275)
  at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:371)
  at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:191)
  at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:933)
  at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:177)
  at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(HttpsURLConnectionImpl.java:153)
  at com.google.api.client.http.javanet.NetHttpRequest.execute(NetHttpRequest.java:93)
  at com.google.api.client.http.HttpRequest.execute(HttpRequest.java:965)
  at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:410)
  at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.executeUnparsed(AbstractGoogleClientRequest.java:343)
  at com.google.api.client.googleapis.services.AbstractGoogleClientRequest.execute(AbstractGoogleClientRequest.java:460)
  at com.google.cloud.hadoop.gcsio.GoogleCloudStorageImpl.getBucket(GoogleCloudStorageImpl.java:1557)
  at com.google.cloud.hadoop.gcsio.GoogleCloudStorageImpl.getItemInfo(GoogleCloudStorageImpl.java:1512)
  at com.google.cloud.hadoop.gcsio.CacheSupplementedGoogleCloudStorage.getItemInfo(CacheSupplementedGoogleCloudStorage.java:516)
  at com.google.cloud.hadoop.gcsio.GoogleCloudStorageFileSystem.getFileInfo(GoogleCloudStorageFileSystem.java:1016)
  at com.google.cloud.hadoop.gcsio.GoogleCloudStorageFileSystem.exists(GoogleCloudStorageFileSystem.java:382)
  at com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase.configureBuckets(GoogleHadoopFileSystemBase.java:1639)
  at com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystem.configureBuckets(GoogleHadoopFileSystem.java:71)
  at com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase.configure(GoogleHadoopFileSystemBase.java:1587)
  at com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase.initialize(GoogleHadoopFileSystemBase.java:776)
  at com.google.cloud.hadoop.fs.gcs.GoogleHadoopFileSystemBase.initialize(GoogleHadoopFileSystemBase.java:739)
  at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2596)
  at org.apache.hadoop.fs.FileSystem.access$200(FileSystem.java:91)
  at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:2630)
  at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:2612)
  at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:370)
  at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:169)
  at org.apache.spark.deploy.yarn.Client.prepareLocalResources(Client.scala:216)
  at org.apache.spark.deploy.yarn.Client.createContainerLaunchContext(Client.scala:384)
  at org.apache.spark.deploy.yarn.Client.submitApplication(Client.scala:102)
  at org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.start(YarnClientSchedulerBackend.scala:58)
  at org.apache.spark.scheduler.TaskSchedulerImpl.start(TaskSchedulerImpl.scala:141)
  at org.apache.spark.SparkContext.<init>(SparkContext.scala:381)
  at org.apache.spark.repl.SparkILoop.createSparkContext(SparkILoop.scala:1016)
  at $line3.$read$$iwC$$iwC.<init>(<console>:9)
  at $line3.$read$$iwC.<init>(<console>:18)
  at $line3.$read.<init>(<console>:20)
  at $line3.$read$.<init>(<console>:24)
  at $line3.$read$.<clinit>(<console>)
  at $line3.$eval$.<init>(<console>:7)
  at $line3.$eval$.<clinit>(<console>)
  at $line3.$eval.$print(<console>)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at org.apache.spark.repl.SparkIMain$ReadEvalPrint.call(SparkIMain.scala:1065)
  at org.apache.spark.repl.SparkIMain$Request.loadAndRun(SparkIMain.scala:1338)
  at org.apache.spark.repl.SparkIMain.loadAndRunReq$1(SparkIMain.scala:840)
  at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:871)
  at org.apache.spark.repl.SparkIMain.interpret(SparkIMain.scala:819)
  at org.apache.spark.repl.SparkILoop.reallyInterpret$1(SparkILoop.scala:856)
  at org.apache.spark.repl.SparkILoop.interpretStartingWith(SparkILoop.scala:901)
  at org.apache.spark.repl.SparkILoop.command(SparkILoop.scala:813)
  at org.apache.spark.repl.SparkILoopInit$$anonfun$initializeSpark$1.apply(SparkILoopInit.scala:123)
  at org.apache.spark.repl.SparkILoopInit$$anonfun$initializeSpark$1.apply(SparkILoopInit.scala:122)
  at org.apache.spark.repl.SparkIMain.beQuietDuring(SparkIMain.scala:324)
  at org.apache.spark.repl.SparkILoopInit$class.initializeSpark(SparkILoopInit.scala:122)
  at org.apache.spark.repl.SparkILoop.initializeSpark(SparkILoop.scala:64)
  at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1$$anonfun$apply$mcZ$sp$5.apply$mcV$sp(SparkILoop.scala:973)
  at org.apache.spark.repl.SparkILoopInit$class.runThunks(SparkILoopInit.scala:157)
  at org.apache.spark.repl.SparkILoop.runThunks(SparkILoop.scala:64)
  at org.apache.spark.repl.SparkILoopInit$class.postInitialization(SparkILoopInit.scala:106)
  at org.apache.spark.repl.SparkILoop.postInitialization(SparkILoop.scala:64)
  at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply$mcZ$sp(SparkILoop.scala:990)
  at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
  at org.apache.spark.repl.SparkILoop$$anonfun$org$apache$spark$repl$SparkILoop$$process$1.apply(SparkILoop.scala:944)
  at scala.tools.nsc.util.ScalaClassLoader$.savingContextLoader(ScalaClassLoader.scala:135)
  at org.apache.spark.repl.SparkILoop.org$apache$spark$repl$SparkILoop$$process(SparkILoop.scala:944)
  at org.apache.spark.repl.SparkILoop.process(SparkILoop.scala:1058)
  at org.apache.spark.repl.Main$.main(Main.scala:31)
  at org.apache.spark.repl.Main.main(Main.scala)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:606)
  at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:569)
  at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:166)
  at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:189)
  at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:110)
  at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

正如预期的那样，只需致电org.apache.spark.scheduler.cluster.YarnClientSchedulerBackend.start，它就会尝试联系Google云端存储，但由于没有外部IP而无法进行GCS访问，因此会失败。

要解决此问题，您可以在创建群集时使用-F hdfs以将HDFS用作默认文件系统;在这种情况下，即使没有外部IP地址，一切都应该在集群内工作。在该模式下，只要通过指定完整的gs://bucket/object路径作为Hadoop参数分配外部IP地址，您甚至可以继续使用GCS。但请注意，在这种情况下，只要您删除了外部IP地址，就无法使用GCS，除非您还配置了代理服务器并通过代理处理所有数据; GCS配置为fs.gs.proxy.address。

一般情况下，除了您已经在＆＃34;默认＆＃34;中打开了新的许可规则之外，没有必要担心安全问题。 Google Compute Engine中的网络防火墙规则。

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