hadoop - 级联2.1.6 + hadoop 1.0.4错误

Question

嗨，我是级联的新手，并遵循《带级联的企业数据工作流》一书。
我使用hadoop 1.0.4进行了检查，并下载了层叠2.1.6。我通过netbeans IDE的所有jar文件设置了所有内容。

代码:

     package main.java.impatient;

     import java.util.Properties;

     import cascading.flow.Flow;
     import cascading.flow.FlowDef;
     import cascading.flow.hadoop.HadoopFlowConnector;
     import cascading.pipe.Pipe;
     import cascading.property.AppProps;
     import cascading.scheme.hadoop.TextDelimited;
     import cascading.tap.Tap;
     import cascading.tap.hadoop.Hfs;
     import cascading.tuple.Fields;


 public class
    Main
{
 public static void
main( String[] args )
{
String inPath = args[ 0 ];
String outPath = args[ 1 ];

Properties properties = new Properties();
AppProps.setApplicationJarClass( properties, Main.class );
HadoopFlowConnector flowConnector = new HadoopFlowConnector( properties );

// create the source tap
Tap inTap = new Hfs( new TextDelimited( true, "\t" ), inPath );

// create the sink tap
Tap outTap = new Hfs( new TextDelimited( true, "\t" ), outPath );

// specify a pipe to connect the taps
Pipe copyPipe = new Pipe( "copy" );

// connect the taps, pipes, etc., into a flow
FlowDef flowDef = FlowDef.flowDef()
 .addSource( copyPipe, inTap )
 .addTailSink( copyPipe, outTap );

// run the flow
flowConnector.connect( flowDef ).complete();
}
  }

这是错误:

      Exception in thread "main" cascading.flow.FlowException: step failed: (1/1) ...ka/cascading/part1/output, with job id: job_201310020226_0004, please see cluster logs for failure messages
at cascading.flow.planner.FlowStepJob.blockOnJob(FlowStepJob.java:210)
at cascading.flow.planner.FlowStepJob.start(FlowStepJob.java:145)
at cascading.flow.planner.FlowStepJob.call(FlowStepJob.java:120)
at cascading.flow.planner.FlowStepJob.call(FlowStepJob.java:42)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
at java.lang.Thread.run(Thread.java:680)

Hadoop作业错误:

    java.io.IOException: Split class cascading.tap.hadoop.io.MultiInputSplit not found
at org.apache.hadoop.mapred.MapTask.getSplitDetails(MapTask.java:387)
at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:412)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:372)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:396)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1121)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
     Caused by: java.lang.ClassNotFoundException: cascading.tap.hadoop.io.MultiInputSplit
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:249)
at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:820)
at org.apache.hadoop.mapred.MapTask.getSplitDetails(MapTask.java:385)
... 7 more

谁能帮我

谢谢

Answer 1

与Cascading + libjars = ClassNotFoundException. Sometimes类似，

我在 hadoop-env.sh 中添加了以下代码，它解决了

        export HADOOP_CLASSPATH="path_to_cascading_libs/lib/*":$HADOOP_CLASSPATH