windows配置hadoop-1.1.0的伪分布式环境

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　　由于Hadoop的部分操作需要用到Linux的shell命令，所以在Windows下安装，需要安装一个Linux的运行时环境。然后，需要配置无密钥通信协议。配置完后，需要配置Hadoop的xml文件。
　　

安装Cygwin
　　http://cygwin.com/install.html
　　

Cygwin中配置sshd
　　http://docs.oracle.com/cd/E24628_01/install.121/e22624/preinstall_req_cygwin_ssh.htm#CBHIAFGI
　　

伪分布式配置
　　配置文档路径： hadoop-1.1.0/docs/single_node_setup.html
　　

bin/hadoop namenode -format
bin/start-all.sh
bin/stop-all.sh
http://localhost:50030
http://localhost:50070
　　

遇到的问题及解决：
　　在真正运行的时刻会遇到几个问题:
　　
　　1、设置的路径并非使用cygwin linux的路径。
　　hadoop.tmp.dir在/tmp目录下面，理论上应该在C:\cygwin\tmp，但实际的路径确实C:\tmp
　　
　　路径不同意，我们就设置自己的目录就可以了

     <property>
<name>hadoop.tmp.dir</name>
<value>/cygwin/home/Winseliu/cloud</value>
</property>
　　
　　2、启动datanode和jobtracker，以及tasktacker时会有路径权限的问题
　　

2012-11-25 13:53:05,031 ERROR org.apache.hadoop.security.UserGroupInformation: PriviledgedActionException as:Winseliu cause:java.io.IOException: Failed to set permissions of path: C:\cygwin\home\Winseliu\hadoop-1.1.0\logs\history to 0755
2012-11-25 13:53:05,032 FATAL org.apache.hadoop.mapred.JobTracker: java.io.IOException: Failed to set permissions of path: C:\cygwin\home\Winseliu\hadoop-1.1.0\logs\history to 0755
at org.apache.hadoop.fs.FileUtil.checkReturnValue(FileUtil.java:689)
at org.apache.hadoop.fs.FileUtil.setPermission(FileUtil.java:670)
at org.apache.hadoop.fs.RawLocalFileSystem.setPermission(RawLocalFileSystem.java:509)
at org.apache.hadoop.fs.RawLocalFileSystem.mkdirs(RawLocalFileSystem.java:344)
at org.apache.hadoop.fs.FilterFileSystem.mkdirs(FilterFileSystem.java:189)
at org.apache.hadoop.mapred.JobHistory.init(JobHistory.java:510)

　　

2012-11-25 13:53:04,389 INFO org.apache.hadoop.mapred.TaskTracker: Good mapred local directories are: /cygwin/home/Winseliu/cloud/mapred/local
2012-11-25 13:53:04,396 ERROR org.apache.hadoop.mapred.TaskTracker: Can not start task tracker because java.io.IOException: Failed to set permissions of path: \cygwin\home\Winseliu\cloud\mapred\local\taskTracker to 0755
at org.apache.hadoop.fs.FileUtil.checkReturnValue(FileUtil.java:689)
at org.apache.hadoop.fs.FileUtil.setPermission(FileUtil.java:670)

　　
　　权限问题，直接修改FileUtils的checkReturnValue()方法，替换hadoop-core-1.1.0.jar中的FileUtils.class文件

  private static void checkReturnValue(boolean rv, File p,
FsPermission permission
) throws IOException {
if (!rv) {
// FIXME
try {
throw new IOException("Failed to set permissions of path: " + p
+ " to " + String.format("%04o", permission.toShort()));
} catch (Exception e) {
e.printStackTrace();
}
}
}
　　
　　3、使用jps查不全真正执行的java进程，不知道那个进程启动或未启动
　　

Winseliu@WINSE ~/hadoop-1.1.0
$ jps
6364 NameNode
7168 JobTracker
2692 Jps
Winseliu@WINSE ~/hadoop-1.1.0
$ ps aux | grep java
7880       1    5544       7028  ?       1001 13:20:40 /cygdrive/c/Java/jdk1.7.0_02/bin/java
5968       1    7500       4592  ?       1001 13:20:36 /cygdrive/c/Java/jdk1.7.0_02/bin/java
5784       1     484       6364  pty0    1001 13:20:31 /cygdrive/c/Java/jdk1.7.0_02/bin/java
6732       1     484       7168  pty0    1001 13:20:38 /cygdrive/c/Java/jdk1.7.0_02/bin/java
7976       1    5716       5628  ?       1001 13:20:34 /cygdrive/c/Java/jdk1.7.0_02/bin/java
4492       0       0       4492  pty0    1001   Jan  1 /cygdrive/c/Java/jdk1.7.0_02/bin/java

　　
　　直接再执行一次start-all.sh，如果会提示让你先stop就说明该进程已经启动了。
　　

Winseliu@WINSE ~
$ cd hadoop-1.1.0/
Winseliu@WINSE ~/hadoop-1.1.0
$ bin/start-all.sh
starting namenode, logging to /home/Winseliu/hadoop-1.1.0/libexec/../logs/hadoop-Winseliu-namenode-WINSE.out
localhost: starting datanode, logging to /home/Winseliu/hadoop-1.1.0/libexec/../logs/hadoop-Winseliu-datanode-WINSE.out
localhost: starting secondarynamenode, logging to /home/Winseliu/hadoop-1.1.0/libexec/../logs/hadoop-Winseliu-secondarynamenode-WINSE.out
starting jobtracker, logging to /home/Winseliu/hadoop-1.1.0/libexec/../logs/hadoop-Winseliu-jobtracker-WINSE.out
localhost: starting tasktracker, logging to /home/Winseliu/hadoop-1.1.0/libexec/../logs/hadoop-Winseliu-tasktracker-WINSE.out
Winseliu@WINSE ~/hadoop-1.1.0
$ bin/start-all.sh
namenode running as process 2648. Stop it first.
localhost: datanode running as process 3512. Stop it first.
localhost: secondarynamenode running as process 2468. Stop it first.
jobtracker running as process 2388. Stop it first.
localhost: tasktracker running as process 860. Stop it first.
Winseliu@WINSE ~/hadoop-1.1.0
$