Hadoop HDFS 测试运行问题 - org.apache.hadoop.conf.Configuration NoClassDefFoundError
我正在使用 Hadoop 0.21.0。并尝试运行 C API 库附带的 hdfs_test 应用程序。经过许多问题后，我能够编译 hdfs_test。现在，当我运行它时：
./hdfs_test
我收到以下错误：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:153)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
... 1 more
Can't construct instance of class org.apache.hadoop.conf.Configuration
Oops! Failed to connect to hdfs!
感谢任何帮助..谢谢
I'm working with Hadoop 0.21.0. and trying to run the hdfs_test application that comes alongside the C API library. After many problems I was able to compile hdfs_test. Now when I'm running it:
./hdfs_test
I'm getting the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.apache.hadoop.conf.Configuration.<clinit>(Configuration.java:153)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:217)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
... 1 more
Can't construct instance of class org.apache.hadoop.conf.Configuration
Oops! Failed to connect to hdfs!
Any help is appreciated.. thanks
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与任何其他 Java 程序一样，您需要类路径或 jar 内的依赖项。 Hadoop 还有一个 HADOOP_CLASSPATH 来告诉集群在哪里可以找到 Map-Reduce 任务中的依赖项。另请参阅如何运行 Hadoop 程序？
Like any other Java program you need the dependencies in the classpath or inside the jar. Hadoop also has an HADOOP_CLASSPATH to tell the cluster where to find dependencies in map-reduce tasks. Also see How to run a Hadoop program?