tomcat - Hadoop 2.2 : classpath not found excpetion

Question

我正在尝试使用 CYGWIN 在 Window 7 64 位上运行 hadoop，并按照 http://raseshmori.wordpress.com/2012/09/23/install-hadoop-2-0-1-yarn-nextgen/ 中的安装说明进行操作.

我能够成功检查 hadoop 版本:

vgv@IPLCEWKS02820 ~/yarn/hadoop
$ ./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 /C:/cygwin64/home/vgv/yarn/hadoop/share/hadoop/common/hadoop-common-2.2.0.jar

我的 ~/.bashrc 如下:

export HADOOP_HOME=$HOME/yarn/hadoop
export HADOOP_MAPRED_HOME=$HOME/yarn/hadoop
export HADOOP_COMMON_HOME=$HOME/yarn/hadoop
export HADOOP_HDFS_HOME=$HOME/yarn/hadoop
export HADOOP_YARN_HOME=$HOME/yarn/hadoop
export HADOOP_CONF_DIR=$HOME/yarn/hadoop/etc/hadoop
export YARN_CONF_DIR=$HADOOP_CONF_DIR

但是，我无法格式化'namenode'

vgv@IPLCEWKS02820 ~/yarn/hadoop
$ ./bin/hadoop namenode -format
DEPRECATED: Use of this script to execute hdfs command is deprecated.
Instead use the hdfs command for it.

     18 [main] bash 3948 fork: child -1 - forked process 1284 died unexpectedly, retry 0, exit code 0xC0000005, errno 11
/home/vgv/yarn/hadoop/bin/../libexec/hadoop-config.sh: fork: retry: Resource temporarily unavailable
Error: Could not find or load main class org.apache.hadoop.hdfs.server.namenode.NameNode

vgv@IPLCEWKS02820 ~/yarn/hadoop
$ ./bin/hadoop hdfs namenode -format
Error: Could not find or load main class hdfs

甚至，我无法启动 HDFS 进程:

vgv@IPLCEWKS02820 ~/yarn/hadoop
$ ./sbin/hadoop-daemon.sh start namenode
starting namenode, logging to /home/vgv/yarn/hadoop/logs/hadoop-vgv-namenode-IPLCEWKS02820.out
Error: Could not find or load main class org.apache.hadoop.hdfs.server.namenode.NameNode

请帮我解决这个错误。

Answer 1

通过在控制台中运行以下命令来检查 $HOME 变量下的值:

# echo $HOME

如果你得到这样的输出:

/root 

或 /home/用户名

检查 ~/.bashrc 文件下的相对路径。

HTH!!