Question

当我执行hdfs namenode -format命令时，我得到以下异常：

Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/hadoop/util/PlatformName : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:615)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:283)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:58)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:197)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: org.apache.hadoop.util.PlatformName.  Program will exit.

Answer 1

此问题与java版本不匹配有关，即编译hadoop的版本高于计算机上安装的jdk版本。安装正确的jdk版本并正确设置JAVA_HOME

执行hdfs namenode -format时的异常

1 个答案: