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Java.io.IOException：没有适用于方案的文件系统：hdfs。

scalahadoopapache-sparkhdfsapache-spark-mllib
3
我正在使用Cloudera Quickstart VM CDH5.3.0（关于软件包的安装）和Spark 1.2.0。设置了$SPARK_HOME=/opt/cloudera/parcels/CDH-5.3.0-1.cdh5.3.0.p0.30/lib/spark并使用以下命令提交Spark应用程序： ./bin/spark-submit --class <Spark_App_Main_Class_Name> --master spark://localhost.localdomain:7077 --deploy-mode client --executor-memory 4G ../apps/<Spark_App_Target_Jar_Name>.jar 其中<Spark_App_Main_Class_Name>指的是Spark应用程序主类名，<Spark_App_Target_Jar_Name>.jar是要提交的Spark应用程序的目标jar包的名称。
import org.apache.spark.SparkContext
import org.apache.spark.SparkConf
import org.apache.spark.mllib.util.MLUtils


object Spark_App_Main_Class_Name {

    def main(args: Array[String]) {
        val hConf = new SparkConf()
            .set("fs.hdfs.impl", classOf[org.apache.hadoop.hdfs.DistributedFileSystem].getName)
            .set("fs.file.impl", classOf[org.apache.hadoop.fs.LocalFileSystem].getName)
        val sc = new SparkContext(hConf)
        val data = MLUtils.loadLibSVMFile(sc, "hdfs://localhost.localdomain:8020/analytics/data/mllib/sample_libsvm_data.txt")
        ...
    }

}

在以客户端模式spark-submit应用程序时，我遇到了org.apache.hadoop.hdfs.DistributedFileSystem的ClassNotFoundException

[cloudera@localhost bin]$ ./spark-submit --class Spark_App_Main_Class_Name --master spark://localhost.localdomain:7077 --deploy-mode client --executor-memory 4G ../apps/Spark_App_Target_Jar_Name.jar
15/11/30 09:46:34 INFO SparkContext: Spark configuration:
spark.app.name=Spark_App_Main_Class_Name
spark.driver.extraLibraryPath=/opt/cloudera/parcels/CDH-5.3.0-1.cdh5.3.0.p0.30/lib/hadoop/lib/native
spark.eventLog.dir=hdfs://localhost.localdomain:8020/user/spark/applicationHistory
spark.eventLog.enabled=true
spark.executor.extraLibraryPath=/opt/cloudera/parcels/CDH-5.3.0-1.cdh5.3.0.p0.30/lib/hadoop/lib/native
spark.executor.memory=4G
spark.jars=file:/opt/cloudera/parcels/CDH-5.3.0-1.cdh5.3.0.p0.30/lib/spark/bin/../apps/Spark_App_Target_Jar_Name.jar
spark.logConf=true
spark.master=spark://localhost.localdomain:7077
spark.yarn.historyServer.address=http://localhost.localdomain:18088
15/11/30 09:46:34 WARN Utils: Your hostname, localhost.localdomain resolves to a loopback address: 127.0.0.1; using 10.113.234.150 instead (on interface eth12)
15/11/30 09:46:34 WARN Utils: Set SPARK_LOCAL_IP if you need to bind to another address
15/11/30 09:46:34 INFO SecurityManager: Changing view acls to: cloudera
15/11/30 09:46:34 INFO SecurityManager: Changing modify acls to: cloudera
15/11/30 09:46:34 INFO SecurityManager: SecurityManager: authentication disabled; ui acls disabled; users with view permissions: Set(cloudera); users with modify permissions: Set(cloudera)
15/11/30 09:46:35 INFO Slf4jLogger: Slf4jLogger started
15/11/30 09:46:35 INFO Remoting: Starting remoting
15/11/30 09:46:35 INFO Remoting: Remoting started; listening on addresses :[akka.tcp://sparkDriver@10.113.234.150:59473]
15/11/30 09:46:35 INFO Remoting: Remoting now listens on addresses: [akka.tcp://sparkDriver@10.113.234.150:59473]
15/11/30 09:46:35 INFO Utils: Successfully started service 'sparkDriver' on port 59473.
15/11/30 09:46:36 INFO SparkEnv: Registering MapOutputTracker
15/11/30 09:46:36 INFO SparkEnv: Registering BlockManagerMaster
15/11/30 09:46:36 INFO DiskBlockManager: Created local directory at /tmp/spark-local-20151130094636-8c3d
15/11/30 09:46:36 INFO MemoryStore: MemoryStore started with capacity 267.3 MB
15/11/30 09:46:38 INFO HttpFileServer: HTTP File server directory is /tmp/spark-7d1f2861-a568-4919-8f7e-9a9fe6aab2b4
15/11/30 09:46:38 INFO HttpServer: Starting HTTP Server
15/11/30 09:46:38 INFO Utils: Successfully started service 'HTTP file server' on port 50003.
15/11/30 09:46:38 INFO Utils: Successfully started service 'SparkUI' on port 4040.
15/11/30 09:46:38 INFO SparkUI: Started SparkUI at http://10.113.234.150:4040
15/11/30 09:46:39 INFO SparkContext: Added JAR file:/opt/cloudera/parcels/CDH-5.3.0-1.cdh5.3.0.p0.30/lib/spark/bin/../apps/Spark_App_Target_Jar_Name.jar at http://10.113.234.150:50003/jars/Spark_App_Target_Jar_Name.jar with timestamp 1448894799228
15/11/30 09:46:39 INFO AppClient$ClientActor: Connecting to master spark://localhost.localdomain:7077...
15/11/30 09:46:40 INFO SparkDeploySchedulerBackend: Connected to Spark cluster with app ID app-20151130094640-0000
15/11/30 09:46:41 INFO NettyBlockTransferService: Server created on 56458
15/11/30 09:46:41 INFO BlockManagerMaster: Trying to register BlockManager
15/11/30 09:46:41 INFO BlockManagerMasterActor: Registering block manager 10.113.234.150:56458 with 267.3 MB RAM, BlockManagerId(<driver>, 10.113.234.150, 56458)
15/11/30 09:46:41 INFO BlockManagerMaster: Registered BlockManager
Exception in thread "main" java.lang.RuntimeException: java.lang.ClassNotFoundException: Class org.apache.hadoop.hdfs.DistributedFileSystem not found
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2047)
    at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2578)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367)
    at org.apache.spark.util.FileLogger.<init>(FileLogger.scala:90)
    at org.apache.spark.scheduler.EventLoggingListener.<init>(EventLoggingListener.scala:63)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:352)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:92)
    at Spark_App_Main_Class_Name$.main(Spark_App_Main_Class_Name.scala:22)
    at Spark_App_Main_Class_Name.main(Spark_App_Main_Class_Name.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$.launch(SparkSubmit.scala:358)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)
Caused by: java.lang.ClassNotFoundException: Class org.apache.hadoop.hdfs.DistributedFileSystem not found
    at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:1953)
    at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:2045)
    ... 16 more

看起来Spark应用程序无法映射HDFS，因为最初我收到了以下错误：

Exception in thread "main" java.io.IOException: No FileSystem for scheme: hdfs
    at org.apache.hadoop.fs.FileSystem.getFileSystemClass(FileSystem.java:2584)
    at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:2591)
    at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:367)
    at org.apache.spark.util.FileLogger.<init>(FileLogger.scala:90)
    at org.apache.spark.scheduler.EventLoggingListener.<init>(EventLoggingListener.scala:63)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:352)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:92)
    at LogisticRegressionwithBFGS$.main(LogisticRegressionwithBFGS.scala:21)
    at LogisticRegressionwithBFGS.main(LogisticRegressionwithBFGS.scala)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.spark.deploy.SparkSubmit$.launch(SparkSubmit.scala:358)
    at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:75)
    at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

我按照hadoop No FileSystem for scheme: file的方法，将"fs.hdfs.impl"和"fs.file.impl"添加到Spark配置设置中。

3个回答
10
你需要在类路径中拥有hadoop-hdfs-2.x jars，可以使用（Maven链接）下载。在提交应用程序时，使用spark-submit的--jar选项指定额外的jar位置。
另外，你最好转移到CDH5.5，它支持spark1.5。
在使用spark-submit提交应用程序时，使用--jars选项添加了hadoop-hdfs的jar包，但是出现了java.lang.ClassNotFoundException：<Spark_App_Main_Class_Name>的错误。 - somnathchakrabarti
./spark-submit --class Spark_App_Main_Class_Name --master spark://localhost.localdomain:7077 --deploy-mode client --executor-memory 4G --jars /opt/cloudera/parcels/CDH/lib/hadoop-hdfs/*.jar ../apps/Spark_App_Target_Jar_Name.jar 已解决ClassNotFoundException，但在Spark Master WebUI下没有看到任何已完成的应用程序。 - somnathchakrabarti
2

当我从我的IDE运行Spark代码并访问远程HDFS时，遇到了同样的问题。


所以我设置了以下配置，问题得到了解决。

JavaSparkContext jsc=new JavaSparkContext(conf);
Configuration hadoopConfig = jsc.hadoopConfiguration();
hadoopConfig.set("fs.hdfs.impl",org.apache.hadoop.hdfs.DistributedFileSystem.class.getName());
hadoopConfig.set("fs.file.impl",org.apache.hadoop.fs.LocalFileSystem.class.getName());
请在您的回答中添加一些上下文。解释它是如何解决问题的。否则，您可能会被投票降低和/或关闭帖子。 - Neuron
请将以下与编程相关的内容从英语翻译成中文。仅返回翻译后的文本，并修复缩进。 - Neuron
0

经过详细搜索和尝试不同的方法，我已经解决了这个问题。基本上，问题似乎是由于缺少hadoop-hdfs jars而导致的，但在提交spark应用程序时，即使使用maven-assembly-plugin或maven-jar-plugin/maven-dependency-plugin，也找不到依赖的jars。

在maven-jar-plugin/maven-dependency-plugin组合中，主类jar和依赖的jars被创建，但仍然使用--jar选项提供依赖的jars会导致以下相同的错误

./spark-submit --class Spark_App_Main_Class_Name --master spark://localhost.localdomain:7077 --deploy-mode client --executor-memory 4G --jars ../apps/Spark_App_Target_Jar_Name-dep.jar ../apps/Spark_App_Target_Jar_Name.jar

使用maven-shade-plugin，如hadoop-no-filesystem-for-scheme-file中"krookedking"所建议的那样，似乎恰到好处地解决了问题，因为创建一个包含主类和所有依赖类的单个jar文件消除了类路径问题。

我的最终工作spark-submit命令如下：

./spark-submit --class Spark_App_Main_Class_Name --master spark://localhost.localdomain:7077 --deploy-mode client --executor-memory 4G ../apps/Spark_App_Target_Jar_Name.jar

我的项目pom.xml中的maven-shade-plugin如下：

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-shade-plugin</artifactId>
        <version>2.4.2</version>
        <executions>
            <execution>
                <phase>package</phase>
                <goals>
                    <goal>shade</goal>
                </goals>
                <configuration>
                    <filters>
                        <filter>
                            <artifact>*:*</artifact>
                            <excludes>
                                <exclude>META-INF/*.SF</exclude>
                                <exclude>META-INF/*.DSA</exclude>
                                <exclude>META-INF/*.RSA</exclude>
                            </excludes>
                        </filter>
                    </filters>
                    <transformers>
                        <transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
                    </transformers>
                </configuration>
            </execution>
        </executions>
      </plugin>

注意：在过滤器中的排除将使得

java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
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