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1.  规划

1.1.  机器列表

1.2.  机器列表

2.  添加用户

[root@centoshadoop ~]# useradd hadoop

[root@centoshadoop ~]# passwd hadoop

Changing password for user hadoop.

New password:

BAD PASSWORD: The password is shorter than 8 characters

Retype new password:

passwd: all authentication tokens updated successfully.

[root@centoshadoop ~]#

3.  设置IP与服务器名映射

[root@centoshadoop ~]# vi /etc/hosts

192.168.1.80 centoshadoop centoshadoop.smartmap.com

并修改Windows中的hosts文件

C:\Windows\System32\drivers\etc

4.  免密码登录

4.1.  免密码登录范围

要求能通过免登录包括使用IP和主机名都能免密码登录：

1) NameNode能免密码登录所有的DataNode

2) SecondaryNameNode能免密码登录所有的DataNode

3) NameNode能免密码登录自己

4) SecondaryNameNode能免密码登录自己

5) NameNode能免密码登录SecondaryNameNode

6) SecondaryNameNode能免密码登录NameNode

7) DataNode能免密码登录自己

8) DataNode不需要配置免密码登录NameNode、SecondaryNameNode和其它DataNode。

4.2.  SSH无密码配置

4.2.1. 所有节点准备密钥

4.2.1.1. 创建密钥对

[hadoop@centoshadoop ~]$ ssh-keygen -t rsa

Generating public/private rsa key pair.

Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):

Created directory ‘/home/hadoop/.ssh‘.

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /home/hadoop/.ssh/id_rsa.

Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.

The key fingerprint is:

SHA256:4hSyoWOuj5MS+ME0ukspvAbfowEbv8iL4ZhfFrETtns hadoop@centoshadoop.smartmap.com

The key‘s randomart image is:

+---[RSA 2048]----+

|                 |

|                 |

|    * .          |

|  oo O .         |

|+++.* o S        |

|*B+. * .         |

|=X+o+ E          |

|%B+=o.           |

|@X*. .           |

+----[SHA256]-----+

[hadoop@centoshadoop ~]$ ls -la .ssh/

total 8

drwx------ 2 hadoop hadoop   38 Apr 16 21:00 .

drwx------ 3 hadoop hadoop   74 Apr 16 21:00 ..

-rw------- 1 hadoop hadoop 1675 Apr 16 21:00 id_rsa

-rw-r--r-- 1 hadoop hadoop  414 Apr 16 21:00 id_rsa.pub

[hadoop@centoshadoop ~]$

4.2.1.2. 创建存放公钥的文件

[hadoop@centoshadoop ~]$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

[hadoop@centoshadoop ~]$ chmod 600 ~/.ssh/authorized_keys

[hadoop@centoshadoop ~]$ ls -la ~/.ssh/

total 12

drwx------ 2 hadoop hadoop   61 Apr 16 21:02 .

drwx------ 3 hadoop hadoop   74 Apr 16 21:00 ..

-rw------- 1 hadoop hadoop  414 Apr 16 21:02 authorized_keys

-rw------- 1 hadoop hadoop 1675 Apr 16 21:00 id_rsa

-rw-r--r-- 1 hadoop hadoop  414 Apr 16 21:00 id_rsa.pub

[hadoop@centoshadoop ~]$

4.2.2. 验证

[hadoop@centoshadoop ~]$ ssh hadoop@192.168.1.80

The authenticity of host ‘192.168.1.80 (192.168.1.80)‘ can‘t be established.

ECDSA key fingerprint is SHA256:lgN0eOtdLR2eqHh+fabe54DGpV08ZiWo9oWVS60aGzw.

ECDSA key fingerprint is MD5:28:c0:cf:21:35:29:3d:23:d3:62:ca:0e:82:7a:4b:af.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added ‘192.168.1.80‘ (ECDSA) to the list of known hosts.

Last login: Mon Apr 16 21:00:08 2018 from 192.168.1.100

[hadoop@centoshadoop ~]$ exit

logout

Connection to 192.168.1.80 closed.

[hadoop@centoshadoop ~]$ ssh hadoop@192.168.1.80

Last login: Mon Apr 16 21:04:40 2018 from 192.168.1.80

[hadoop@centoshadoop ~]$ exit

logout

Connection to 192.168.1.80 closed.

[hadoop@centoshadoop ~]$

5.  上传软件

将下载好的JDK与hadoop包上传到服务器上

以root用户上传目录为 /opt/

6.  安装JDK

6.1.  解压JDK包

[hadoop@centoshadoop ~]$ su - root

Password:

Last login: Mon Apr 16 20:41:23 CST 2018 from 192.168.1.100 on pts/0

[root@centoshadoop ~]# cd /opt/

[root@centoshadoop opt]# ll

total 346708

-rw-r--r-- 1 root root 216929574 Apr 16 20:17 hadoop-2.7.5.tar.gz

-rw-r--r-- 1 root root 138094686 Apr 14 20:04 jdk-7u45-linux-x64.tar.gz

[root@centoshadoop opt]# mkdir java

[root@centoshadoop opt]# tar -zxvf jdk-7u45-linux-x64.tar.gz

jdk1.7.0_45/

jdk1.7.0_45/db/

jdk1.7.0_45/db/lib/

……

jdk1.7.0_45/man/man1/javadoc.1

jdk1.7.0_45/THIRDPARTYLICENSEREADME.txt

jdk1.7.0_45/COPYRIGHT

[root@centoshadoop opt]# ls -la

total 346708

drwxr-xr-x.  4 root root        97 Apr 16 21:14 .

dr-xr-xr-x. 17 root root       244 Apr 16 20:35 ..

-rw-r--r--   1 root root 216929574 Apr 16 20:17 hadoop-2.7.5.tar.gz

drwxr-xr-x   2 root root         6 Apr 16 21:13 java

drwxr-xr-x   8   10  143       233 Oct  8  2013 jdk1.7.0_45

-rw-r--r--   1 root root 138094686 Apr 14 20:04 jdk-7u45-linux-x64.tar.gz

[root@centoshadoop opt]# mv jdk1.7.0_45/ java/

[root@centoshadoop opt]# ls -la

total 346708

drwxr-xr-x.  3 root root        78 Apr 16 21:17 .

dr-xr-xr-x. 17 root root       244 Apr 16 20:35 ..

-rw-r--r--   1 root root 216929574 Apr 16 20:17 hadoop-2.7.5.tar.gz

drwxr-xr-x   3 root root        25 Apr 16 21:17 java

-rw-r--r--   1 root root 138094686 Apr 14 20:04 jdk-7u45-linux-x64.tar.gz

[root@centoshadoop opt]# cd java/

[root@centoshadoop java]# ls -la

total 0

drwxr-xr-x  3 root root  25 Apr 16 21:17 .

drwxr-xr-x. 3 root root  78 Apr 16 21:17 ..

drwxr-xr-x  8   10  143 233 Oct  8  2013 jdk1.7.0_45

[root@centoshadoop java]# cd ..

[root@centoshadoop opt]#

6.2.  配置环境变量

[root@centoshadoop opt]# vi /etc/profile

在其结尾加入如下的内容

export JAVA_HOME=/opt/java/jdk1.7.0_45

export JRE_HOME=/opt/java/jdk1.7.0_45/jre

export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH

export PATH=$JAVA_HOME/bin:$PATH

[root@centoshadoop opt]# source /etc/profile

[root@centoshadoop opt]# java -version

java version "1.7.0_45"

Java(TM) SE Runtime Environment (build 1.7.0_45-b18)

Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

[root@centoshadoop opt]#

[root@centoshadoop opt]# rm -rf jdk-7u45-linux-x64.tar.gz

[root@centoshadoop opt]#

7.  Hadoop安装及其环境配置

7.1.  解压Hadoop包

[root@centoshadoop opt]# mkdir hadoop

[root@centoshadoop opt]# ls -la

total 211848

drwxr-xr-x.  4 root root        59 Apr 16 21:28 .

dr-xr-xr-x. 17 root root       244 Apr 16 20:35 ..

drwxr-xr-x   2 root root         6 Apr 16 21:28 hadoop

-rw-r--r--   1 root root 216929574 Apr 16 20:17 hadoop-2.7.5.tar.gz

drwxr-xr-x   3 root root        25 Apr 16 21:17 java

[root@centoshadoop opt]# tar -zxvf hadoop-2.7.5.tar.gz

……

hadoop-2.7.5/share/doc/hadoop-project/hadoop-datajoin/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-ant/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-extras/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-pipes/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-openstack/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-aws/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-azure/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-minicluster/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-sls/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-tools/

hadoop-2.7.5/share/doc/hadoop-project/hadoop-dist/

hadoop-2.7.5/share/doc/hadoop-project/

[root@centoshadoop opt]# ls -la

total 211848

drwxr-xr-x.  5 root  root        79 Apr 16 21:31 .

dr-xr-xr-x. 17 root  root       244 Apr 16 20:35 ..

drwxr-xr-x   2 root  root         6 Apr 16 21:28 hadoop

drwxr-xr-x   9 20415  101       149 Dec 16 09:12 hadoop-2.7.5

-rw-r--r--   1 root  root 216929574 Apr 16 20:17 hadoop-2.7.5.tar.gz

drwxr-xr-x   3 root  root        25 Apr 16 21:17 java

[root@centoshadoop opt]# mv hadoop-2.7.5/ hadoop/

[root@centoshadoop opt]# ls -la

total 211848

drwxr-xr-x.  4 root root        59 Apr 16 21:32 .

dr-xr-xr-x. 17 root root       244 Apr 16 20:35 ..

drwxr-xr-x   3 root root        26 Apr 16 21:32 hadoop

-rw-r--r--   1 root root 216929574 Apr 16 20:17 hadoop-2.7.5.tar.gz

drwxr-xr-x   3 root root        25 Apr 16 21:17 java

[root@centoshadoop opt]# rm -rf hadoop-2.7.5.tar.gz

7.2.  修改Hadoop包的用户

[root@centoshadoop opt]# chown hadoop:hadoop -R hadoop/

[root@centoshadoop opt]#

7.3.  Hadoop环境配置

7.3.1. 把Hadoop的安装路径添加到”/etc/profile”中

 [root@centoshadoop opt]# vi /etc/profile

# export JAVA_HOME=/opt/java/jdk1.7.0_45

# export JRE_HOME=/opt/java/jdk1.7.0_45/jre

# export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH

# export PATH=$JAVA_HOME/bin:$PATH

export JAVA_HOME=/opt/java/jdk1.7.0_45

export CLASSPATH=.:$JAVA_HOME/lib:$CLASSPATH

export HADOOP_HOME=/opt/hadoop/hadoop-2.7.5

export HADOOP_MAPRED_HOME=$HADOOP_HOME

export HADOOP_COMMON_HOME=$HADOOP_HOME

export HADOOP_HDFS_HOME=$HADOOP_HOME

export YARN_HOME=$HADOOP_HOME

export HADOOP_CONF_DIR=$HADOOP_HOME/etc/hadoop

export YARN_CONF_DIR=$HADOOP_HOME/etc/hadoop

export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin:$HADOOP_HOME/sbin

export LD_LIBRARY_PATH=$JAVA_HOME/jre/lib/amd64/server:/usr/local/lib:$HADOOP_HOME/lib/native

export JAVA_LIBRARY_PATH=$LD_LIBRARY_PATH:$JAVA_LIBRARY_PATH

[root@centoshadoop opt]# source /etc/profile

[root@centoshadoop opt]#

7.3.2. 创建目录

[root@centoshadoop opt]# exit

logout

[hadoop@centoshadoop ~]$ cd /opt/

[hadoop@centoshadoop opt]$

[hadoop@centoshadoop opt]# mkdir /opt/hadoop/tmp

[hadoop@centoshadoop opt]# mkdir -p /opt/hadoop/data/hdfs/name

[hadoop@centoshadoop opt]# mkdir -p /opt/hadoop/data/hdfs/data

[hadoop@centoshadoop opt]# mkdir -p /opt/hadoop/data/hdfs/checkpoint

[hadoop@centoshadoop opt]# mkdir -p /opt/hadoop/data/yarn/local

[hadoop@centoshadoop opt]# mkdir -p /opt/hadoop/pid

[hadoop@centoshadoop opt]# mkdir -p /opt/hadoop/log

[hadoop@centoshadoop opt]#

7.3.3. 配置hadoop-env.sh

[hadoop@centoshadoop opt]$ vi /opt/hadoop/hadoop-2.7.5/etc/hadoop/hadoop-env.sh

[hadoop@centoshadoop opt]$

# export JAVA_HOME=${JAVA_HOME}

export JAVA_HOME=/opt/java/jdk1.7.0_45

export HADOOP_PID_DIR=/home/hadoop/pid

export HADOOP_LOG_DIR=/home/hadoop/log

[hadoop@centoshadoop opt]$ source /etc/profile

[hadoop@centoshadoop opt]$ source /opt/hadoop/hadoop-2.7.5/etc/hadoop/hadoop-env.sh

[hadoop@centoshadoop opt]$ hadoop version

Hadoop 2.7.5

Subversion https://shv@git-wip-us.apache.org/repos/asf/hadoop.git -r 18065c2b6806ed4aa6a3187d77cbe21bb3dba075

Compiled by kshvachk on 2017-12-16T01:06Z

Compiled with protoc 2.5.0

From source with checksum 9f118f95f47043332d51891e37f736e9

This command was run using /opt/hadoop/hadoop-2.7.5/share/hadoop/common/hadoop-common-2.7.5.jar

[hadoop@centoshadoop opt]$

7.3.4. 配置yarn-env.sh

[hadoop@centoshadoop opt]$ vi /opt/hadoop/hadoop-2.7.5/etc/hadoop/yarn-env.sh

[hadoop@centoshadoop opt]$

# export JAVA_HOME=/home/y/libexec/jdk1.6.0/

export JAVA_HOME=/opt/java/jdk1.7.0_45

7.3.5. 配置etc/hadoop/core-site.xml

<configuration>

       <property>

              <name>hadoop.tmp.dir</name>

              <value>/opt/hadoop/tmp</value>

       </property>

       <property>

              <name>fs.defaultFS</name>

              <value>hdfs://192.168.1.80:9000</value>

       </property>

</configuration>

7.3.6. 配置etc/hadoop/hdfs-site.xml

<configuration>

       <property>

              <name>dfs.namenode.http-address</name>

              <value>192.168.1.80:50070</value>

       </property>

<property>

              <name>dfs.namenode.http-bind-host</name>

              <value>192.168.1.80</value>

       </property>

       <property>

              <name>dfs.namenode.secondary.http-address</name>

              <value>192.168.1.80:50090</value>

       </property>

       <property>

              <name>dfs.replication</name>

              <value>1</value>

       </property> 

   <property>  

        <name>dfs.namenode.name.dir</name>  

        <value>/opt/hadoop/data/hdfs/name</value>  

   </property>

       <property>  

        <name>dfs.datanode.data.dir</name>  

        <value>/opt/hadoop/data/hdfs/data</value>  

   </property>

       <property>  

        <name>dfs.namenode.checkpoint.dir</name>  

        <value>/opt/hadoop/data/hdfs/checkpoint</value>  

   </property>

</configuration>

7.3.7. 配置etc/hadoop/mapred-site.xml

<configuration>

       <property>

              <name>mapreduce.framework.name</name>

              <value>yarn</value>

       </property>

</configuration>

7.3.8. 配置etc/hadoop/yarn-site.xml

<configuration>

       <property>

              <name>yarn.resourcemanager.hostname</name>

              <value>192.168.1.80</value>

       </property>

       <property>

              <name>yarn.nodemanager.aux-services</name>

              <value>mapreduce_shuffle</value>

       </property>

       <property>

              <name>yarn.nodemanager.local-dirs</name>

              <value>/opt/hadoop/data/yarn/local</value>

       </property>

</configuration>

7.3.9. 配置etc/hadoop/slaves

[hadoop@centoshadoop hadoop]$ vi /opt/hadoop/hadoop-2.7.5/etc/hadoop/slaves

[hadoop@centoshadoop hadoop]$

192.168.1.80

8.  启动

8.1.  启动HDFS

8.1.1. 格式化NameNode

[hadoop@centoshadoop hadoop]$ hdfs namenode -format

18/04/16 22:24:38 INFO namenode.NameNode: STARTUP_MSG:

/************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = centoshadoop.smartmap.com/192.168.1.80

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 2.7.5

8.1.2. 启动与停止HDFS

[hadoop@centoshadoop hadoop]$  . /opt/hadoop/hadoop-2.7.5/sbin/start-dfs.sh

/usr/bin/which: invalid option -- ‘b‘

/usr/bin/which: invalid option -- ‘s‘

/usr/bin/which: invalid option -- ‘h‘

Usage: /usr/bin/which [options] [--] COMMAND [...]

Write the full path of COMMAND(s) to standard output.

Report bugs to< which-bugs@gnu.org>.

Starting namenodes on [centoshadoop]

The authenticity of host ‘centoshadoop (192.168.1.80)‘ can‘t be established.

ECDSA key fingerprint is SHA256:lgN0eOtdLR2eqHh+fabe54DGpV08ZiWo9oWVS60aGzw.

ECDSA key fingerprint is MD5:28:c0:cf:21:35:29:3d:23:d3:62:ca:0e:82:7a:4b:af.

Are you sure you want to continue connecting (yes/no)? yes

centoshadoop: Warning: Permanently added ‘centoshadoop‘ (ECDSA) to the list of known hosts.

centoshadoop: starting namenode, logging to /home/hadoop/log/hadoop-hadoop-namenode-centoshadoop.smartmap.com.out

192.168.1.80: starting datanode, logging to /home/hadoop/log/hadoop-hadoop-datanode-centoshadoop.smartmap.com.out

Starting secondary namenodes [0.0.0.0]

The authenticity of host ‘0.0.0.0 (0.0.0.0)‘ can‘t be established.

ECDSA key fingerprint is SHA256:lgN0eOtdLR2eqHh+fabe54DGpV08ZiWo9oWVS60aGzw.

ECDSA key fingerprint is MD5:28:c0:cf:21:35:29:3d:23:d3:62:ca:0e:82:7a:4b:af.

Are you sure you want to continue connecting (yes/no)? yes

0.0.0.0: Warning: Permanently added ‘0.0.0.0‘ (ECDSA) to the list of known hosts.

0.0.0.0: starting secondarynamenode, logging to /home/hadoop/log/hadoop-hadoop-secondarynamenode-centoshadoop.smartmap.com.out

[hadoop@centoshadoop hadoop]$ jps

8210 NameNode

8334 DataNode

8611 Jps

8495 SecondaryNameNode

[hadoop@centoshadoop hadoop]$

8.2.  启动YARN

[hadoop@centoshadoop opt]$ cd /opt/hadoop/hadoop-2.7.5

[hadoop@centoshadoop hadoop-2.7.5]$

[hadoop@centoshadoop hadoop-2.7.5]$ sbin/start-yarn.sh

starting yarn daemons

starting resourcemanager, logging to /opt/hadoop/hadoop-2.7.5/logs/yarn-hadoop-resourcemanager-centoshadoop.smartmap.com.out

192.168.1.80: starting nodemanager, logging to /opt/hadoop/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-centoshadoop.smartmap.com.out

[hadoop@centoshadoop hadoop-2.7.5]$

[hadoop@centoshadoop hadoop-2.7.5]$ jps

11478 NodeManager

11373 ResourceManager

10580 SecondaryNameNode

10413 DataNode

10283 NameNode

11792 Jps

[hadoop@centoshadoop hadoop-2.7.5]$

设置logger级别，看下具体原因

export HADOOP_ROOT_LOGGER=DEBUG,console

8.3.  查看节点情况

[hadoop@centoshadoop hadoop-2.7.5]$ hadoop dfsadmin -report

DEPRECATED: Use of this script to execute hdfs command is deprecated.

Instead use the hdfs command for it.

18/04/16 23:17:14 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

Configured Capacity: 38635831296 (35.98 GB)

Present Capacity: 37050920960 (34.51 GB)

DFS Remaining: 37050908672 (34.51 GB)

DFS Used: 12288 (12 KB)

DFS Used%: 0.00%

Under replicated blocks: 0

Blocks with corrupt replicas: 0

Missing blocks: 0

Missing blocks (with replication factor 1): 0

-------------------------------------------------

Live datanodes (1):

Name: 192.168.1.80:50010 (centoshadoop)

Hostname: centoshadoop

Decommission Status : Normal

Configured Capacity: 38635831296 (35.98 GB)

DFS Used: 12288 (12 KB)

Non DFS Used: 1584910336 (1.48 GB)

DFS Remaining: 37050908672 (34.51 GB)

DFS Used%: 0.00%

DFS Remaining%: 95.90%

Configured Cache Capacity: 0 (0 B)

Cache Used: 0 (0 B)

Cache Remaining: 0 (0 B)

Cache Used%: 100.00%

Cache Remaining%: 0.00%

Xceivers: 1

Last contact: Mon Apr 16 23:17:13 CST 2018

[hadoop@centoshadoop hadoop-2.7.5]$

8.4.  通过网页查看集群

http://192.168.1.80:50070/dfshealth.html#tab-overview

http://192.168.1.80:8088/cluster

9.  如何运行自带wordcount

9.1.  找到该程序所在的位置

[hadoop@namenode sbin]$ cd /opt/hadoop/hadoop-2.7.5/share/hadoop/mapreduce/

[hadoop@namenode mapreduce]$ ll

total 5196

-rw-r--r-- 1 hadoop hadoop  571621 Nov 14 07:28 hadoop-mapreduce-client-app-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop  787871 Nov 14 07:28 hadoop-mapreduce-client-common-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop 1611701 Nov 14 07:28 hadoop-mapreduce-client-core-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop  200628 Nov 14 07:28 hadoop-mapreduce-client-hs-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop   32802 Nov 14 07:28 hadoop-mapreduce-client-hs-plugins-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop   71360 Nov 14 07:28 hadoop-mapreduce-client-jobclient-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop 1623508 Nov 14 07:28 hadoop-mapreduce-client-jobclient-2.9.0-tests.jar

-rw-r--r-- 1 hadoop hadoop   85175 Nov 14 07:28 hadoop-mapreduce-client-shuffle-2.9.0.jar

-rw-r--r-- 1 hadoop hadoop  303317 Nov 14 07:28 hadoop-mapreduce-examples-2.9.0.jar

drwxr-xr-x 2 hadoop hadoop    4096 Nov 14 07:28 jdiff

drwxr-xr-x 2 hadoop hadoop    4096 Nov 14 07:28 lib

drwxr-xr-x 2 hadoop hadoop      30 Nov 14 07:28 lib-examples

drwxr-xr-x 2 hadoop hadoop    4096 Nov 14 07:28 sources

[hadoop@namenode mapreduce]$

9.2.  准备数据

9.2.1. 先在HDFS创建几个数据目录

[hadoop@namenode mapreduce]$ hadoop fs -mkdir -p /data/wordcount

[hadoop@namenode mapreduce]$ hadoop fs -mkdir -p /output/

[hadoop@namenode mapreduce]$

目录/data/wordcount用来存放Hadoop自带的WordCount例子的数据文件，运行这个MapReduce任务的结果输出到/output/wordcount目录中

9.2.2.   创建测试数据

[hadoop@namenode mapreduce]$ vi /opt/hadoop/inputWord

9.2.3.   上传数据

[hadoop@namenode mapreduce]$ hadoop fs -put /opt/hadoop/inputWord /data/wordcount/

9.2.4.   显示文件

[hadoop@namenode mapreduce]$ hadoop fs -ls /data/wordcount/

Found 1 items

-rw-r--r--   2 hadoop supergroup        241 2018-04-15 22:01 /data/wordcount/inputWord

9.2.5.   查看文件内容

[hadoop@namenode mapreduce]$ hadoop fs -text /data/wordcount/inputWord

hello smartmap

hello gispathfinder

language c

language c++

language c#

language java

language python

language r

web javascript

web html

web css

gis arcgis

gis supermap

gis mapinfo

gis qgis

gis grass

gis sage

webgis leaflet

webgis openlayers

[hadoop@namenode mapreduce]$

9.3.  运行WordCount例子

[hadoop@namenode mapreduce]$ hadoop jar /opt/hadoop/hadoop-2.9.0/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.9.0.jar wordcount /data/wordcount /output/wordcount

18/04/15 22:10:08 INFO client.RMProxy: Connecting to ResourceManager at /192.168.1.121:8032

18/04/15 22:10:09 INFO input.FileInputFormat: Total input files to process : 1

18/04/15 22:10:09 INFO mapreduce.JobSubmitter: number of splits:1

18/04/15 22:10:09 INFO Configuration.deprecation: yarn.resourcemanager.system-metrics-publisher.enabled is deprecated. Instead, use yarn.system-metrics-publisher.enabled

18/04/15 22:10:10 INFO mapreduce.JobSubmitter: Submitting tokens for job: job_1523794216379_0001

18/04/15 22:10:10 INFO impl.YarnClientImpl: Submitted application application_1523794216379_0001

18/04/15 22:10:10 INFO mapreduce.Job: The url to track the job: http://nameNode:8088/proxy/application_1523794216379_0001/

18/04/15 22:10:10 INFO mapreduce.Job: Running job: job_1523794216379_0001

18/04/15 22:10:20 INFO mapreduce.Job: Job job_1523794216379_0001 running in uber mode : false

18/04/15 22:10:20 INFO mapreduce.Job:  map 0% reduce 0%

18/04/15 22:10:30 INFO mapreduce.Job:  map 100% reduce 0%

18/04/15 22:10:40 INFO mapreduce.Job:  map 100% reduce 100%

18/04/15 22:10:40 INFO mapreduce.Job: Job job_1523794216379_0001 completed successfully

18/04/15 22:10:40 INFO mapreduce.Job: Counters: 49

        File System Counters

                FILE: Number of bytes read=305

                FILE: Number of bytes written=404363

                FILE: Number of read operations=0

                FILE: Number of large read operations=0

                FILE: Number of write operations=0

                HDFS: Number of bytes read=356

                HDFS: Number of bytes written=203

                HDFS: Number of read operations=6

                HDFS: Number of large read operations=0

                HDFS: Number of write operations=2

        Job Counters

                Launched map tasks=1

                Launched reduce tasks=1

                Data-local map tasks=1

                Total time spent by all maps in occupied slots (ms)=7775

                Total time spent by all reduces in occupied slots (ms)=6275

                Total time spent by all map tasks (ms)=7775

                Total time spent by all reduce tasks (ms)=6275

                Total vcore-milliseconds taken by all map tasks=7775

                Total vcore-milliseconds taken by all reduce tasks=6275

                Total megabyte-milliseconds taken by all map tasks=7961600

                Total megabyte-milliseconds taken by all reduce tasks=6425600

        Map-Reduce Framework

                Map input records=19

                Map output records=38

                Map output bytes=393

                Map output materialized bytes=305

                Input split bytes=115

                Combine input records=38

                Combine output records=24

                Reduce input groups=24

                Reduce shuffle bytes=305

                Reduce input records=24

                Reduce output records=24

                Spilled Records=48

                Shuffled Maps =1

                Failed Shuffles=0

                Merged Map outputs=1

                GC time elapsed (ms)=1685

                CPU time spent (ms)=2810

                Physical memory (bytes) snapshot=476082176

                Virtual memory (bytes) snapshot=1810911232

                Total committed heap usage (bytes)=317718528

        Shuffle Errors

                BAD_ID=0

                CONNECTION=0

                IO_ERROR=0

                WRONG_LENGTH=0

                WRONG_MAP=0

                WRONG_REDUCE=0

        File Input Format Counters

                Bytes Read=241

        File Output Format Counters

                Bytes Written=203

[hadoop@namenode mapreduce]$

9.4.  查看结果

9.4.1.   通过服务器上查看

[hadoop@namenode mapreduce]$ hadoop fs -ls /output/wordcount

Found 2 items

-rw-r--r--   2 hadoop supergroup          0 2018-04-15 22:10 /output/wordcount/_SUCCESS

-rw-r--r--   2 hadoop supergroup        203 2018-04-15 22:10 /output/wordcount/part-r-00000

[hadoop@namenode mapreduce]$ hadoop fs -text /output/wordcount/part-r-00000

arcgis  1

c       1

c#      1

c++     1

css     1

gis     6

gispathfinder   1

grass   1

hello   2

html    1

java    1

javascript      1

language        6

leaflet 1

mapinfo 1

openlayers      1

python  1

qgis    1

r       1

sage    1

smartmap        1

supermap        1

web     3

webgis  2

[hadoop@namenode mapreduce]$

9.4.2. 通过Web UI查看

http://192.168.1.121:50070/explorer.html#/output/wordcount

CentOS7.4 + Hadoop2.7.5安装配置管理（伪分布式）

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原文地址：https://www.cnblogs.com/gispathfinder/p/9064230.html