本人环境如下：
VM 9.0
Ubuntu 12.04
Hadoop 0.20.203.0
Eclipse helios-sr2-linux-gtk.xxx
Eclipse 工作目录：/home/hadoop/workspace
安装目录：/opt/eclipse
Hadoop 安装目录：/usr/local/hadoop
本人在参考两篇文章搭建时，基本上比较顺利，在操作过程中，也出现过一些错误或异常，在参考上面链接中的两篇描述，肯定是可以解决的。
但是，在做经典的wordcount时，参考的文章没有给出具体的连接，因为当时参考了很多博客文章，可以说没有一篇中提到的方法，能解决本人试验过程中出现的异常或错误。
遗憾的是，试验的过程中出现的很多错误或异常，本人没有具体记录错误或异常的描述，姑且概述为：“Hadoop上传文件到HDFS时异常”！
在下面的试验步骤中，本人力求完全展示操作步骤，所有的操作尽量原始，基本上是将操作步骤直接复制过来的，可能看上去有些乱，但是却是最真实的。
下面是操作的步骤，本人尽量详细的加以说明。
adoop@ubuntu:~$ ls
Desktop Downloads Music Public Videos
Documents examples.desktop Pictures Templates workspace
hadoop@ubuntu:~$ cd /usr
hadoop@ubuntu:/usr$ cd local
hadoop@ubuntu:/usr/local$ ls
bin games hadoop-0.20.203.0rc1.tar.gz lib sbin src
etc hadoop include man share
hadoop@ubuntu:/usr/local$ cd hadoop/
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs LICENSE.txt
build.xml hadoop-ant-0.20.203.0.jar logs
c++ hadoop-core-0.20.203.0.jar NOTICE.txt
CHANGES.txt hadoop-examples-0.20.203.0.jar README.txt
conf hadoop-test-0.20.203.0.jar src
contrib hadoop-tools-0.20.203.0.jar webapps
data1 ivy word.txt
data2 ivy.xml word.txt~
datalog1 lib
datalog2 librecordio
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs LICENSE.txt
build.xml hadoop-ant-0.20.203.0.jar logs
c++ hadoop-core-0.20.203.0.jar NOTICE.txt
CHANGES.txt hadoop-examples-0.20.203.0.jar README.txt
conf hadoop-test-0.20.203.0.jar src
contrib hadoop-tools-0.20.203.0.jar webapps
data1 ivy word.txt
data2 ivy.xml word.txt~
datalog1 lib
datalog2 librecordio
hadoop@ubuntu:/usr/local/hadoop$ cd data1
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
current detach storage tmp
hadoop@ubuntu:/usr/local/hadoop/data1$chmod 777 current
hadoop@ubuntu:/usr/local/hadoop/data1$ rm-rf current
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
detach storage tmp
hadoop@ubuntu:/usr/local/hadoop/data1$chmod 777 tmp
hadoop@ubuntu:/usr/local/hadoop/data1$ rm-rf tmp
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
detach storage
hadoop@ubuntu:/usr/local/hadoop/data1$chmod 777 detach
hadoop@ubuntu:/usr/local/hadoop/data1$ rm-rf detach
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
storage
hadoop@ubuntu:/usr/local/hadoop/data1$chmod 777 storage
hadoop@ubuntu:/usr/local/hadoop/data1$ rm-rf storage
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
hadoop@ubuntu:/usr/local/hadoop/data1$ cd..
c: command not found
hadoop@ubuntu:/usr/local/hadoop/data1$ cd..
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs LICENSE.txt
build.xml hadoop-ant-0.20.203.0.jar logs
c++ hadoop-core-0.20.203.0.jar NOTICE.txt
CHANGES.txt hadoop-examples-0.20.203.0.jar README.txt
conf hadoop-test-0.20.203.0.jar src
contrib hadoop-tools-0.20.203.0.jar webapps
data1 ivy word.txt
data2 ivy.xml word.txt~
datalog1 lib
datalog2 librecordio
hadoop@ubuntu:/usr/local/hadoop$ cd data2
hadoop@ubuntu:/usr/local/hadoop/data2$ ls
current detach storage tmp
hadoop@ubuntu:/usr/local/hadoop/data2$chmod 777 current detach
hadoop@ubuntu:/usr/local/hadoop/data2$ rm-rf current detach
hadoop@ubuntu:/usr/local/hadoop/data2$ ls
storage tmp
hadoop@ubuntu:/usr/local/hadoop/data2$chmod 777 storage tmp/
hadoop@ubuntu:/usr/local/hadoop/data2$ ls
storage tmp
hadoop@ubuntu:/usr/local/hadoop/data2$ rm-rf storage tmp/
hadoop@ubuntu:/usr/local/hadoop/data2$ ls
hadoop@ubuntu:/usr/local/hadoop/data2$ ls
hadoop@ubuntu:/usr/local/hadoop/data2$ cd..
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs LICENSE.txt
build.xml hadoop-ant-0.20.203.0.jar logs
c++ hadoop-core-0.20.203.0.jar NOTICE.txt
CHANGES.txt hadoop-examples-0.20.203.0.jar README.txt
conf hadoop-test-0.20.203.0.jar src
contrib hadoop-tools-0.20.203.0.jar webapps
data1 ivy word.txt
data2 ivy.xml word.txt~
datalog1 lib
datalog2 librecordio
hadoop@ubuntu:/usr/local/hadoop$ chmod 777datalog1
hadoop@ubuntu:/usr/local/hadoop$ rm -rfdatalog1
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs librecordio
build.xml hadoop-ant-0.20.203.0.jar LICENSE.txt
c++ hadoop-core-0.20.203.0.jar logs
CHANGES.txt hadoop-examples-0.20.203.0.jar NOTICE.txt
conf hadoop-test-0.20.203.0.jar README.txt
contrib hadoop-tools-0.20.203.0.jar src
data1 ivy webapps
data2 ivy.xml word.txt
datalog2 lib word.txt~
hadoop@ubuntu:/usr/local/hadoop$ chmod 777datalog2
hadoop@ubuntu:/usr/local/hadoop$ rm -rfdatalog2/
hadoop@ubuntu:/usr/local/hadoop$ ls
bin data2 ivy README.txt
build.xml docs ivy.xml src
c++ hadoop-ant-0.20.203.0.jar lib webapps
CHANGES.txt hadoop-core-0.20.203.0.jar librecordio word.txt
conf hadoop-examples-0.20.203.0.jar LICENSE.txt word.txt~
contrib hadoop-test-0.20.203.0.jar logs
data1 hadoop-tools-0.20.203.0.jar NOTICE.txt
hadoop@ubuntu:/usr/local/hadoop$ ls
bin data2 ivy README.txt
build.xml docs ivy.xml src
c++ hadoop-ant-0.20.203.0.jar lib webapps
CHANGES.txt hadoop-core-0.20.203.0.jar librecordio word.txt
conf hadoop-examples-0.20.203.0.jar LICENSE.txt word.txt~
contrib hadoop-test-0.20.203.0.jar logs
data1 hadoop-tools-0.20.203.0.jar NOTICE.txt很乱是吧？
上面所有的操作，目的就一个，为了重新格式化HDFS。因为本人在上传word.txt文件时，总是不成功。具体异常提示没有记录下来…而为了重新格式化，要删除上一次生成的文件或目录，所以上面的所有操作都是为了删除文件或目录。操作步骤比较操蛋呵呵，新手哦… 所以的操作方法或者说命令都是一边“度娘”，一边操作的…
上面的步骤完成后。
重新格式化：
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopnanmenode -format
Exception in thread "main"java.lang.NoClassDefFoundError: nanmenode
Caused by:java.lang.ClassNotFoundException: nanmenode
atjava.net.URLClassLoader$1.run(URLClassLoader.java:217)
atjava.security.AccessController.doPrivileged(Native Method)
atjava.net.URLClassLoader.findClass(URLClassLoader.java:205)
atjava.lang.ClassLoader.loadClass(ClassLoader.java:321)
atsun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
atjava.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: nanmenode.Program will exit.
hadoop@ubuntu:/usr/local/hadoop$ ls
bin data2 ivy README.txt
build.xml docs ivy.xml src
c++ hadoop-ant-0.20.203.0.jar lib webapps
CHANGES.txt hadoop-core-0.20.203.0.jar librecordio word.txt
conf hadoop-examples-0.20.203.0.jar LICENSE.txt word.txt~
contrib hadoop-test-0.20.203.0.jar logs
data1 hadoop-tools-0.20.203.0.jar NOTICE.txt
hadoop@ubuntu:/usr/local/hadoop$ cd data1
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
hadoop@ubuntu:/usr/local/hadoop/data1$ ls
hadoop@ubuntu:/usr/local/hadoop/data1$ cd..
hadoop@ubuntu:/usr/local/hadoop$ mkdirdatalog1
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs librecordio
build.xml hadoop-ant-0.20.203.0.jar LICENSE.txt
c++ hadoop-core-0.20.203.0.jar logs
CHANGES.txt hadoop-examples-0.20.203.0.jar NOTICE.txt
conf hadoop-test-0.20.203.0.jar README.txt
contrib hadoop-tools-0.20.203.0.jar src
data1 ivy webapps
data2 ivy.xml word.txt
datalog1 lib word.txt~
hadoop@ubuntu:/usr/local/hadoop$ mkdir datalog2
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs LICENSE.txt
build.xml hadoop-ant-0.20.203.0.jar logs
c++ hadoop-core-0.20.203.0.jar NOTICE.txt
CHANGES.txt hadoop-examples-0.20.203.0.jar README.txt
conf hadoop-test-0.20.203.0.jar src
contrib hadoop-tools-0.20.203.0.jar webapps
data1 ivy word.txt
data2 ivy.xml word.txt~
datalog1 lib
datalog2 librecordio
上面报了异常，原因是没有创建配置环境时，xml(具体哪个文件，参考开头的两篇博客描述)文件中的默认目录，新建目录后，继续格式化…
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopnamenode -format
13/09/10 16:45:02 INFO namenode.NameNode:STARTUP_MSG:
/************************************************************
STARTUP_MSG: Starting NameNode
STARTUP_MSG: host = ubuntu/127.0.1.1
STARTUP_MSG: args = [-format]
STARTUP_MSG: version = 0.20.203.0
STARTUP_MSG: build =http://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.20-security-203-r 1099333; compiled by 'oom' on Wed May 4 07:57:50 PDT 2011
************************************************************/
Re-format filesystem in/usr/local/hadoop/datalog1 ? (Y or N) Y
Re-format filesystem in/usr/local/hadoop/datalog2 ? (Y or N) Y
13/09/10 16:45:07 INFO util.GSet: VMtype = 32-bit
13/09/10 16:45:07 INFO util.GSet: 2% maxmemory = 19.33375 MB
13/09/10 16:45:07 INFO util.GSet:capacity = 2^22 = 4194304 entries
13/09/10 16:45:07 INFO util.GSet:recommended=4194304, actual=4194304
13/09/10 16:45:08 INFO namenode.FSNamesystem:fsOwner=hadoop
13/09/10 16:45:08 INFOnamenode.FSNamesystem: supergroup=supergroup
13/09/10 16:45:08 INFOnamenode.FSNamesystem: isPermissionEnabled=true
13/09/10 16:45:08 INFOnamenode.FSNamesystem: dfs.block.invalidate.limit=100
13/09/10 16:45:08 INFOnamenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0min(s), accessTokenLifetime=0 min(s)
13/09/10 16:45:08 INFO namenode.NameNode:Caching file names occuring more than 10 times
13/09/10 16:45:08 INFO common.Storage:Image file of size 112 saved in 0 seconds.
13/09/10 16:45:08 INFO common.Storage:Storage directory /usr/local/hadoop/datalog1 has been successfully formatted.
13/09/10 16:45:08 INFO common.Storage:Image file of size 112 saved in 0 seconds.
13/09/10 16:45:08 INFO common.Storage:Storage directory /usr/local/hadoop/datalog2 has been successfully formatted.
13/09/10 16:45:08 INFO namenode.NameNode:SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode atubuntu/127.0.1.1
************************************************************/格式完成后，接着启动
hadoop@ubuntu:/usr/local/hadoop$bin/start-all.sh
starting namenode, logging to/usr/local/hadoop/logs/hadoop-hadoop-namenode-ubuntu.out
127.0.0.1: starting datanode, logging to/usr/local/hadoop/logs/hadoop-hadoop-datanode-ubuntu.out
127.0.0.1: starting secondarynamenode,logging to /usr/local/hadoop/logs/hadoop-hadoop-secondarynamenode-ubuntu.out
starting jobtracker, logging to/usr/local/hadoop/logs/hadoop-hadoop-jobtracker-ubuntu.out
127.0.0.1: starting tasktracker, logging to/usr/local/hadoop/logs/hadoop-hadoop-tasktracker-ubuntu.out
查看是否所有进程都正常启动
hadoop@ubuntu:/usr/local/hadoop$ jps
3317 DataNode
3593 JobTracker
3521 SecondaryNameNode
3107 NameNode
3833 TaskTracker
3872 Jps
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopdfsadmin -report
Configured Capacity: 40668069888 (37.88 GB)
Present Capacity: 28074295311 (26.15 GB)
DFS Remaining: 28074246144 (26.15 GB)
DFS Used: 49167 (48.01 KB)
DFS Used%: 0%
Under replicated blocks: 1
Blocks with corrupt replicas: 0
Missing blocks: 0
-------------------------------------------------
Datanodes available: 1 (1 total, 0 dead)
Name: 127.0.0.1:50010
Decommission Status : Normal
Configured Capacity: 40668069888 (37.88 GB)
DFS Used: 49167 (48.01 KB)
Non DFS Used: 12593774577 (11.73 GB)
DFS Remaining: 28074246144(26.15 GB)
DFS Used%: 0%
DFS Remaining%: 69.03%
Last contact: Tue Sep 10 16:46:29 PDT 2013
hadoop@ubuntu:/usr/local/hadoop$ ls
bin docs LICENSE.txt
build.xml hadoop-ant-0.20.203.0.jar logs
c++ hadoop-core-0.20.203.0.jar NOTICE.txt
CHANGES.txt hadoop-examples-0.20.203.0.jar README.txt
conf hadoop-test-0.20.203.0.jar src
contrib hadoop-tools-0.20.203.0.jar webapps
data1 ivy word.txt
data2 ivy.xml word.txt~
datalog1 lib
datalog2 librecordio
查看hdfs上的所有文件和目录
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopdfs -lsr /
drwxr-xr-x - hadoop supergroup 02013-09-10 16:45 /tmp
drwxr-xr-x - hadoop supergroup 02013-09-10 16:45 /tmp/hadoop-hadoop
drwxr-xr-x - hadoop supergroup 02013-09-10 16:45 /tmp/hadoop-hadoop/mapred
drwx------ - hadoop supergroup 02013-09-10 16:46 /tmp/hadoop-hadoop/mapred/system
-rw------- 2 hadoop supergroup 42013-09-10 16:46 /tmp/hadoop-hadoop/
新建wordcount目录，并上传word.txt文件
这次正常了，没有抛出异常和错误。
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -mkdir /tmp/wordcount
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -put word.txt /tmp/wordcount/
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopdfs -lsr /
drwxr-xr-x - hadoop supergroup 02013-09-10 16:50 /tmp
drwxr-xr-x - hadoop supergroup 02013-09-10 16:45 /tmp/hadoop-hadoop
drwxr-xr-x - hadoop supergroup 02013-09-10 16:45 /tmp/hadoop-hadoop/mapred
drwx------ - hadoop supergroup 02013-09-10 16:46 /tmp/hadoop-hadoop/mapred/system
-rw------- 2 hadoop supergroup 42013-09-10 16:46 /tmp/hadoop-hadoop/mapred/system/jobtracker.info
drwxr-xr-x - hadoop supergroup 02013-09-10 16:50 /tmp/wordcount
-rw-r--r-- 2 hadoop supergroup 832013-09-10 16:50 /tmp/wordcount/word.txt
查看word.txt文件中的内容：
第一次提示文件不存在，系文件后缀名错误
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -text /tmp/wordcount/word.text
text: File does not exist:/tmp/wordcount/word.text
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -text /tmp/wordcount/word.txt
java c++ python c
java c++ javascript
helloword hadoop
mapreduce java hadoop hbase
hadoop@ubuntu:/usr/local/hadoop$
运行wordcount看效果：
用的hadoop自带的，具体方法如下
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopjar hadoop-examples-0.20.203.0.jar wordcount /tmp/wordcount/word.txt/tmp/outpu1
13/09/10 17:05:16 INFOinput.FileInputFormat: Total input paths to process : 1
13/09/10 17:05:16 INFO mapred.JobClient:Running job: job_201309101645_0002
13/09/10 17:05:17 INFOmapred.JobClient: map 0% reduce 0%
13/09/10 17:05:32 INFOmapred.JobClient: map 100% reduce 0%
13/09/10 17:05:43 INFOmapred.JobClient: map 100% reduce 100%
13/09/10 17:05:49 INFO mapred.JobClient:Job complete: job_201309101645_0002
13/09/10 17:05:49 INFO mapred.JobClient:Counters: 25
13/09/10 17:05:49 INFOmapred.JobClient: Job Counters
13/09/10 17:05:49 INFOmapred.JobClient: Launched reducetasks=1
13/09/10 17:05:49 INFOmapred.JobClient: SLOTS_MILLIS_MAPS=13099
13/09/10 17:05:49 INFOmapred.JobClient: Total time spent byall reduces waiting after reserving slots (ms)=0
13/09/10 17:05:49 INFOmapred.JobClient: Total time spent byall maps waiting after reserving slots (ms)=0
13/09/10 17:05:49 INFOmapred.JobClient: Launched map tasks=1
13/09/10 17:05:49 INFOmapred.JobClient: Data-local maptasks=1
13/09/10 17:05:49 INFOmapred.JobClient: SLOTS_MILLIS_REDUCES=10098
13/09/10 17:05:49 INFOmapred.JobClient: File Output FormatCounters
13/09/10 17:05:49 INFOmapred.JobClient: Bytes Written=80
13/09/10 17:05:49 INFOmapred.JobClient: FileSystemCounters
13/09/10 17:05:49 INFOmapred.JobClient: FILE_BYTES_READ=122
13/09/10 17:05:49 INFOmapred.JobClient: HDFS_BYTES_READ=192
13/09/10 17:05:49 INFOmapred.JobClient: FILE_BYTES_WRITTEN=42599
13/09/10 17:05:49 INFOmapred.JobClient: HDFS_BYTES_WRITTEN=80
13/09/10 17:05:49 INFOmapred.JobClient: File Input FormatCounters
13/09/10 17:05:49 INFOmapred.JobClient: Bytes Read=83
13/09/10 17:05:49 INFOmapred.JobClient: Map-Reduce Framework
13/09/10 17:05:49 INFOmapred.JobClient: Reduce inputgroups=9
13/09/10 17:05:49 INFOmapred.JobClient: Map outputmaterialized bytes=122
13/09/10 17:05:49 INFO mapred.JobClient: Combine output records=9
13/09/10 17:05:49 INFOmapred.JobClient: Map input records=4
13/09/10 17:05:49 INFOmapred.JobClient: Reduce shufflebytes=122
13/09/10 17:05:49 INFOmapred.JobClient: Reduce outputrecords=9
13/09/10 17:05:49 INFOmapred.JobClient: Spilled Records=18
13/09/10 17:05:49 INFOmapred.JobClient: Map outputbytes=135
13/09/10 17:05:49 INFOmapred.JobClient: Combine inputrecords=13
13/09/10 17:05:49 INFOmapred.JobClient: Map outputrecords=13
13/09/10 17:05:49 INFOmapred.JobClient: SPLIT_RAW_BYTES=109
13/09/10 17:05:49 INFOmapred.JobClient: Reduce inputrecords=9
hadoop@ubuntu:/usr/local/hadoop$
查看
浏览器中输入：http://localhost:50070, 回到主目录
查找一下，点击：part-r-00000
结果如下图所示：
命令行方式查看结果
hadoop@ubuntu:/usr/local/hadoop$
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -lsr /
drwxr-xr-x - hadoop supergroup 02013-09-10 17:05 /tmp
drwxr-xr-x - hadoop supergroup 02013-09-10 16:45 /tmp/hadoop-hadoop
drwxr-xr-x - hadoop supergroup 02013-09-10 17:04 /tmp/hadoop-hadoop/mapred
drwxr-xr-x - hadoop supergroup 02013-09-10 17:04 /tmp/hadoop-hadoop/mapred/staging
drwxr-xr-x - hadoop supergroup 02013-09-10 17:04 /tmp/hadoop-hadoop/mapred/staging/hadoop
drwx------ - hadoop supergroup 02013-09-10 17:05 /tmp/hadoop-hadoop/mapred/staging/hadoop/.staging
drwx------ - hadoop supergroup 02013-09-10 17:04 /tmp/hadoop-hadoop/mapred/staging/hadoop/.staging/job_201309101645_0001
-rw-r--r-- 10 hadoop supergroup 1424692013-09-10 17:04/tmp/hadoop-hadoop/mapred/staging/hadoop/.staging/job_201309101645_0001/job.jar
drwx------ - hadoop supergroup 02013-09-10 17:05 /tmp/hadoop-hadoop/mapred/system
-rw------- 2 hadoop supergroup 42013-09-10 16:46 /tmp/hadoop-hadoop/mapred/system/jobtracker.info
drwxr-xr-x - hadoop supergroup 02013-09-10 17:05 /tmp/outpu1
-rw-r--r-- 2 hadoop supergroup 02013-09-10 17:05 /tmp/outpu1/_SUCCESS
drwxr-xr-x - hadoop supergroup 02013-09-10 17:05 /tmp/outpu1/_logs
drwxr-xr-x - hadoop supergroup 02013-09-10 17:05 /tmp/outpu1/_logs/history
-rw-r--r-- 2 hadoop supergroup 103962013-09-10 17:05 /tmp/outpu1/_logs/history/job_201309101645_0002_1378857916792_hadoop_word+count
-rw-r--r-- 2 hadoop supergroup 199692013-09-10 17:05 /tmp/outpu1/_logs/history/job_201309101645_0002_conf.xml
-rw-r--r-- 2 hadoop supergroup 802013-09-10 17:05 /tmp/outpu1/part-r-00000
drwxr-xr-x - hadoop supergroup 02013-09-10 16:50 /tmp/wordcount
-rw-r--r-- 2 hadoop supergroup 832013-09-10 16:50 /tmp/wordcount/word.txt
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -text /tmp/output1/part-r-00000text: File does not exist: /tmp/output1/part-r-00000
//目录名敲错了
hadoop@ubuntu:/usr/local/hadoop$ bin/hadoopfs -cat /tmp/outpu1/part-r-00000
c 1
c++ 2
hadoop 2
hbase 1
helloword 1
java 3
javascript 1
mapreduce 1
python 1
hadoop@ubuntu:/usr/local/hadoop$注：
hadoop 版本：20.203 自带的貌似有问题，jar文件打包不全。请自行下载，网上可以搜索到。
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