Question

我使用Cygwin终端在Windows上安装了Apache的Hadoop 2.1版测试版。运行命令hadoop version会出现此错误：

Error: Could not find or load main class org.apache.hadoop.util.VersionInfo

Answer 1

您还可以将以下内容添加到〜/ .bashrc

export HADOOP_CLASSPATH=$(cygpath -pw $(hadoop classpath)):$HADOOP_CLASSPATH

这为我解决了

Answer 2

我尝试在Windows 2008 Server Sp1 64bit上安装Hadoop 2.2.0时遇到了同样的问题。

我安装了cygwin64并配置了openssh。

user2870991的回答对我有用。修改\ hadoop \ bin \ hadoop脚本，如下所示，注释原始exec行并插入新的exec行。

  #exec "$JAVA" $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"
  #add the -claspath "$(cygpath -pw "$CLASSPATH")" TO FIX the script running in cygwin
  exec "$JAVA" -classpath "$(cygpath -pw "$CLASSPATH")" $JAVA_HEAP_MAX $HADOOP_OPTS $CLASS "$@"

Answer 3

在hadoop-config.sh @ line no 285

中添加以下语句

CLASSPATH=`cygpath -wp "$CLASSPATH"`

//Comments goes here

if [ "$HADOOP_CLASSPATH" != "" ]; then
  # Prefix it if its to be preceded
  if [ "$HADOOP_USER_CLASSPATH_FIRST" != "" ]; then
    CLASSPATH=${HADOOP_CLASSPATH}:${CLASSPATH}
  else
    CLASSPATH=${CLASSPATH}:${HADOOP_CLASSPATH}
  fi
fi

输出：

admin@admin-PC /cygdrive/e/hadoop/hadoop-2.2.0/bin
$ ./hadoop version
Hadoop 2.2.0
Subversion https://svn.apache.org/repos/asf/hadoop/common -r 1529768
Compiled by hortonmu on 2013-10-07T06:28Z
Compiled with protoc 2.5.0
From source with checksum 79e53ce7994d1628b240f09af91e1af4
This command was run using /E:/hadoop/hadoop-2.2.0/share/hadoop/common/hadoop-common-2.2.0.jar

运行“hadoop version”命令时，在Cygwin上的Hadoop中发生CLASSPATH问题

3 个答案: