我是hadoop新手，只有一台windows机器可用。在此基础上，我在virtualbox中创建了两个运行centos 6.2的虚拟机。
我已经经历了几个问题，使机器能够找到彼此，并在机器之间使用无密码登录等。我终于被困在看主机器和从机器上的tasktracker的输出：

2013-08-12 12:44:47,020 WARN org.mortbay.log: Can't reuse /tmp/Jetty_0_0_0_0_50060_task____.2vcltf, using /tmp/Jetty_0_0_0_0_50060_task____.2vcltf_7889818513880644521
2013-08-12 12:44:47,705 INFO org.mortbay.log: Started SelectChannelConnector@0.0.0.0:50060
2013-08-12 12:44:47,707 INFO org.apache.hadoop.mapred.TaskTracker: FILE_CACHE_SIZE for mapOutputServlet set to : 2000
2013-08-12 12:44:48,036 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:44:51,934 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:44:54,065 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:44:55,177 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:44:59,190 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:45:03,717 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:45:08,652 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...
2013-08-12 12:45:12,115 INFO org.apache.hadoop.mapred.TaskTracker: Failed to get system directory...

我意识到这一定与我的配置文件和我在文件系统上的权限等有关，但我不知道是什么。。。我使用脚本start-all.sh和我的专用hadoop用户（简称hadoop）启动了hadoop。
我已经包括了我的配置文件和下面的pastebin上ls-l的一些输出。
我的hadoop conf文件：http://pastebin.com/saypxi9h
ls-l结果：http://pastebin.com/pycy6pvn