在HDFS上目录结构建议
/user/用户名/mr/程序名/输入目录
/user/用户名/mr/程序名/输出目录
/user/zengjr/mr/
wordcount/
/input
/output
关于HDFS文件系统的一些命令
[zengjr@hadoop-zengjr hadoop-2.5.0]$ ./bin/hdfs dfs
Usage: hadoop fs [generic options]
[-appendToFile <localsrc> ... <dst>]
[-cat [-ignoreCrc] <src> ...]
[-checksum <src> ...]
[-chgrp [-R] GROUP PATH...]
[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
[-chown [-R] [OWNER][:[GROUP]] PATH...]
[-copyFromLocal [-f] [-p] <localsrc> ... <dst>]
[-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-count [-q] <path> ...]
[-cp [-f] [-p | -p[topax]] <src> ... <dst>]
[-createSnapshot <snapshotDir> [<snapshotName>]]
[-deleteSnapshot <snapshotDir> <snapshotName>]
[-df [-h] [<path> ...]]
[-du [-s] [-h] <path> ...]
[-expunge]
[-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
[-getfacl [-R] <path>]
[-getfattr [-R] {-n name | -d} [-e en] <path>]
[-getmerge [-nl] <src> <localdst>]
[-help [cmd ...]]
[-ls [-d] [-h] [-R] [<path> ...]]
[-mkdir [-p] <path> ...]
[-moveFromLocal <localsrc> ... <dst>]
[-moveToLocal <src> <localdst>]
[-mv <src> ... <dst>]
[-put [-f] [-p] <localsrc> ... <dst>]
[-renameSnapshot <snapshotDir> <oldName> <newName>]
[-rm [-f] [-r|-R] [-skipTrash] <src> ...]
[-rmdir [--ignore-fail-on-non-empty] <dir> ...]
[-setfacl [-R] [{-b|-k} {-m|-x <acl_spec>} <path>]|[--set <acl_spec> <path>]]
[-setfattr {-n name [-v value] | -x name} <path>]
[-setrep [-R] [-w] <rep> <path> ...]
[-stat [format] <path> ...]
[-tail [-f] <file>]
[-test -[defsz] <path>]
[-text [-ignoreCrc] <src> ...]
[-touchz <path> ...]
[-usage [cmd ...]]
新建文件夹，上传文件，
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user/zengjr
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -ls -R
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -ls -R /
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:01 /test
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:14 /user
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:14 /user/zengjr
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user/zengjr/input
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -put etc/hadoop/*.xml /user/zengjr/input
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -ls -R /
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:01 /test
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:14 /user
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:15 /user/zengjr
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:17 /user/zengjr/input
-rw-r--r-- 1 zengjr supergroup 3589 2014-11-30 23:17 /user/zengjr/input/capacity-scheduler.xml
-rw-r--r-- 1 zengjr supergroup 993 2014-11-30 23:17 /user/zengjr/input/core-site.xml
-rw-r--r-- 1 zengjr supergroup 9201 2014-11-30 23:17 /user/zengjr/input/hadoop-policy.xml
-rw-r--r-- 1 zengjr supergroup 849 2014-11-30 23:17 /user/zengjr/input/hdfs-site.xml
-rw-r--r-- 1 zengjr supergroup 620 2014-11-30 23:17 /user/zengjr/input/httpfs-site.xml
-rw-r--r-- 1 zengjr supergroup 844 2014-11-30 23:17 /user/zengjr/input/mapred-site.xml
-rw-r--r-- 1 zengjr supergroup 794 2014-11-30 23:17 /user/zengjr/input/yarn-site.xml
grep程序运行
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar grep /user/zengjr/input output 'dfs[a-z.]+'
结果查看（或者文件系统中查看50070端口，50090）
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -ls /user/zengjr/output
Found 2 items
-rw-r--r-- 1 zengjr supergroup 0 2014-11-30 23:28 /user/zengjr/output/_SUCCESS
-rw-r--r-- 1 zengjr supergroup 29 2014-11-30 23:28 /user/zengjr/output/part-r-00000
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -cat /user/zengjr/output/part-r-00000
1 dfsadmin
1 dfs.replication
wordcount程序运行
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -ls /user/zengjr
Found 4 items
drwxr-xr-x - zengjr supergroup 0 2014-12-01 00:19 /user/zengjr/grep-temp-550059281
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:17 /user/zengjr/input
drwxr-xr-x - zengjr supergroup 0 2014-11-30 23:28 /user/zengjr/output
drwxr-xr-x - zengjr supergroup 0 2014-12-01 00:34 /user/zengjr/output3
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user/zengjr/mr
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user/zengjr/mr/wordcount
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user/zengjr/mr/wordcount/input
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -mkdir /user/zengjr/mr/wordcount/output
[zengjr@hadoop-zengjr test-datas]$ vi wc.input
hadoop hello
hadoop mapreduce
zengjr hdfs
world yarn
hadoop dfs
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -put test-datas/wc.input /user/zengjr/mr/wordcount/input/
#删除output，运行的时候不能有这个 目录不然会报错
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -rm -r -f /user/zengjr/mr/wordcount/output
14/12/01 01:05:21 INFO fs.TrashPolicyDefault: Namenode trash configuration: Deletion interval = 0 minutes, Emptier interval = 0 minutes.
Deleted /user/zengjr/mr/wordcount/output
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/yarn jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.5.0.jar wordcount /user/zengjr/mr/wordcount/input /user/zengjr/mr/wordcount/output
[zengjr@hadoop-zengjr hadoop-2.5.0]$ bin/hdfs dfs -text /user/zengjr/mr/wordcount/output/part*
dfs 1
hadoop 3
hdfs 1
hello 1
mapreduce 1
world 1
yarn 1
zengjr 1