windows下hadoop中启动tasktracker的问题
我正在尝试在 windows 下使用 hadoop，但当我想启动 tasktracker 时遇到了问题.例如:
I am trying to use hadoop under windows and I am running into a problem when I want to start tasktracker. For example:
$bin/start-all.sh
然后日志写道:
2011-06-08 16:32:18,157 ERROR org.apache.hadoop.mapred.TaskTracker: Can not start task tracker because java.io.IOException: Failed to set permissions of path: /tmp/hadoop-Administrator/mapred/local/taskTracker to 0755
at org.apache.hadoop.fs.RawLocalFileSystem.checkReturnValue(RawLocalFileSystem.java:525)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:507)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:318)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:183)
at org.apache.hadoop.mapred.TaskTracker.initialize(TaskTracker.java:630)
at org.apache.hadoop.mapred.TaskTracker.<init>(TaskTracker.java:1328)
at org.apache.hadoop.mapred.TaskTracker.main(TaskTracker.java:3430)
有什么问题?我该如何解决这个问题?谢谢！
What's the problem? How can I solve this? Thanks!
推荐答案
我在 Windows 服务器上安装 1.0.3 时遇到了这个问题.我更改了 hdfs-site.xml 中的默认目录，以便 hadoop 为 dfs 创建的目录是 cygwin 目录的子目录，如下所示...
I was running into this issue on an installation of 1.0.3 on Windows server. I changed the default directory in hdfs-site.xml so that the directory that hadoop creates for the dfs is a subdir of the cygwin directory like this...
...
<property>
<name>dfs.name.dir</name>
<value>c:/cygwin/usr/mydir/dfs/logs</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>c:/cygwin/usr/mydir/dfs/data</value>
</property>
</configuration>
这似乎解决了问题.
配置文件的 apache 文档在这里
The apache documentation for the config files is here
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