我是靠谱客的博主 殷勤宝贝，最近开发中收集的这篇文章主要介绍教程 | Hadoop集群搭建和简单应用概念了解集群服务器规划安装安装包分发给其他节点配置环境变量查看Hadoop版本在主节点上对Hadoop进行初始化启动查看服务器进程启动web界面简单使用运行一个mapreduce的例子程序：wordcount结语，觉得挺不错的，现在分享给大家，希望可以做个参考。
概述
这是小小本周的第一篇，我是小小，开更本周的第一篇，本篇将会介绍Hadoop集群的简单搭建和简单应用。
概念了解
主从结构：在一个集群众，会有部分节点充当主节点的角色，其他服务器都是从节点的角色，当前这种架构称之为主从结构。主从结构分类：
一主多从
多主多从 Hadoop中的HDFS和YARN都是主从结构，各个角色的名称，以及主从结构的概念方式 | 服务 | 主节点 | 从节点 | |------|------|----------| |HDFS | NameNode | DataNode | | YARN | ResourceManager | NodeManager |
集群服务器规划
使用四台Centos虚拟机进行集群搭建
安装
规划
规划安装用户：hadoop
规划安装目录：/home/hadoop/apps
规划数据目录：/home/hadoop/data
注：apps和data文件夹需要自己单独创建
上传解压缩
使用Hadoop用户
[hadoop@hadoop1 apps]$ ls
hadoop-2.7.5-centos-6.7.tar.gz
[hadoop@hadoop1 apps]$ tar -zxvf hadoop-2.7.5-centos-6.7.tar.gz
修改配置文件
配置文件目录：/home/hadoop/apps/hadoop-2.7.5/etc/hadoop
hadoop-env.sh
[hadoop@hadoop1 hadoop]$ vi hadoop-env.sh
修改JAVA_HOME
export JAVA_HOME=/usr/local/jdk1.8.0_73
core-site.xml
[hadoop@hadoop1 hadoop]$ vi core-site.xml
fs.defaultFS ：这个属性用来指定namenode的hdfs协议的文件系统通信地址，可以指定一个主机+端口，也可以指定为一个namenode服务（这个服务内部可以有多台namenode实现ha的namenode服务
hadoop.tmp.dir : hadoop集群在工作的时候存储的一些临时文件的目录
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://hadoop1:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/home/hadoop/data/hadoopdata</value>
</property>
</configuration>
hdfs-site.xml
[hadoop@hadoop1 hadoop]$ vi hdfs-site.xml
dfs.namenode.name.dir：namenode数据的存放地点。也就是namenode元数据存放的地方，记录了hdfs系统中文件的元数据。
dfs.datanode.data.dir：datanode数据的存放地点。也就是block块存放的目录了。
dfs.replication：hdfs的副本数设置。也就是上传一个文件，其分割为block块后，每个block的冗余副本个数，默认配置是3。
dfs.secondary.http.address：secondarynamenode 运行节点的信息，和 namenode 不同节点
<configuration>
<property>
<name>dfs.namenode.name.dir</name>
<value>/home/hadoop/data/hadoopdata/name</value>
<description>为了保证元数据的安全一般配置多个不同目录</description>
</property>
<property>
<name>dfs.datanode.data.dir</name>
<value>/home/hadoop/data/hadoopdata/data</value>
<description>datanode 的数据存储目录</description>
</property>
<property>
<name>dfs.replication</name>
<value>2</value>
<description>HDFS 的数据块的副本存储个数, 默认是3</description>
</property>
<property>
<name>dfs.secondary.http.address</name>
<value>hadoop3:50090</value>
<description>secondarynamenode 运行节点的信息，和 namenode 不同节点</description>
</property>
</configuration>
mapred-site.xml
[hadoop@hadoop1 hadoop]$ cp mapred-site.xml.template mapred-site.xml
[hadoop@hadoop1 hadoop]$ vi mapred-site.xml
mapreduce.framework.name：指定mr框架为yarn方式,Hadoop二代MP也基于资源管理系统Yarn来运行 。
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
yarn-site.xml
[hadoop@hadoop1 hadoop]$ vi yarn-site.xml
yarn.resourcemanager.hostname：yarn总管理器的IPC通讯地址
yarn.nodemanager.aux-services：
<configuration>
<!-- Site specific YARN configuration properties -->
<property>
<name>yarn.resourcemanager.hostname</name>
<value>hadoop4</value>
</property>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
<description>YARN 集群为 MapReduce 程序提供的 shuffle 服务</description>
</property>
</configuration>
slaves
[hadoop@hadoop1 hadoop]$ vi slaves
hadoop1
hadoop2
hadoop3
hadoop4
安装包分发给其他节点
[hadoop@hadoop1 hadoop]$ scp -r ~/apps/hadoop-2.7.5/ hadoop2:~/apps/
[hadoop@hadoop1 hadoop]$ scp -r ~/apps/hadoop-2.7.5/ hadoop3:~/apps/
[hadoop@hadoop1 hadoop]$ scp -r ~/apps/hadoop-2.7.5/ hadoop4:~/apps/
配置环境变量
[hadoop@hadoop1 ~]$ vi .bashrc
export HADOOP_HOME=/home/hadoop/apps/hadoop-2.7.5
export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:
环境变量生效
[hadoop@hadoop1 bin]$ source ~/.bashrc
查看Hadoop版本
[hadoop@hadoop1 bin]$ hadoop version
Hadoop 2.7.5
Subversion Unknown -r Unknown
Compiled by root on 2017-12-24T05:30Z
Compiled with protoc 2.5.0
From source with checksum 9f118f95f47043332d51891e37f736e9
This command was run using /home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/hadoop-common-2.7.5.jar
[hadoop@hadoop1 bin]$
在主节点上对Hadoop进行初始化
[hadoop@hadoop1 ~]$ hadoop namenode -format
1 [hadoop@hadoop1 ~]$ hadoop namenode -format
2 DEPRECATED: Use of this script to execute hdfs command is deprecated.
3 Instead use the hdfs command for it.
4
5 18/03/03 11:13:24 INFO namenode.NameNode: STARTUP_MSG:
6 /************************************************************
7 STARTUP_MSG: Starting NameNode
8 STARTUP_MSG: host = hadoop1/192.168.123.102
9 STARTUP_MSG: args = [-format]
10 STARTUP_MSG: version = 2.7.5
11 STARTUP_MSG: classpath = /home/hadoop/apps/hadoop-2.7.5/etc/hadoop:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/paranamer-2.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/httpclient-4.2.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jets3t-0.9.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-net-3.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/apacheds-i18n-2.0.0-M15.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jetty-sslengine-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jetty-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-math3-3.1.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jsr305-3.0.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jaxb-impl-2.2.3-1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jsch-0.1.54.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-cli-1.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jsp-api-2.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/hadoop-auth-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/servlet-api-2.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/mockito-all-1.8.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/zookeeper-3.4.6.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-io-2.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-logging-1.1.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jaxb-api-2.2.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jersey-server-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/log4j-1.2.17.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/guava-11.0.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jersey-json-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/xz-1.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-lang-2.6.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/gson-2.2.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/httpcore-4.2.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-compress-1.4.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/java-xmlbuilder-0.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-httpclient-3.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jettison-1.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/slf4j-api-1.7.10.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/api-asn1-api-1.0.0-M20.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/api-util-1.0.0-M20.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/xmlenc-0.52.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/hadoop-annotations-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-beanutils-core-1.8.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-codec-1.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/protobuf-java-2.5.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/asm-3.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/curator-framework-2.7.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/apacheds-kerberos-codec-2.0.0-M15.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/htrace-core-3.1.0-incubating.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/curator-client-2.7.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-digester-1.8.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/activation-1.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jackson-xc-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-beanutils-1.7.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jetty-util-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/stax-api-1.0-2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/avro-1.7.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jersey-core-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/junit-4.11.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/netty-3.6.2.Final.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/jackson-jaxrs-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-collections-3.2.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/hamcrest-core-1.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/curator-recipes-2.7.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/commons-configuration-1.6.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/lib/snappy-java-1.0.4.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/hadoop-common-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/hadoop-nfs-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/common/hadoop-common-2.7.5-tests.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/xercesImpl-2.9.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jetty-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jsr305-3.0.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/commons-cli-1.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/servlet-api-2.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/netty-all-4.0.23.Final.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/commons-io-2.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/commons-logging-1.1.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jersey-server-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/log4j-1.2.17.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/guava-11.0.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/commons-daemon-1.0.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/commons-lang-2.6.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/leveldbjni-all-1.8.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/xml-apis-1.3.04.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/xmlenc-0.52.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/commons-codec-1.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/protobuf-java-2.5.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/asm-3.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/htrace-core-3.1.0-incubating.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jetty-util-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/jersey-core-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/lib/netty-3.6.2.Final.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/hadoop-hdfs-nfs-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/hadoop-hdfs-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/hdfs/hadoop-hdfs-2.7.5-tests.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jetty-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jsr305-3.0.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jaxb-impl-2.2.3-1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/guice-servlet-3.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-cli-1.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/servlet-api-2.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/zookeeper-3.4.6.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-io-2.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/zookeeper-3.4.6-tests.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-logging-1.1.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jaxb-api-2.2.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jersey-server-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/log4j-1.2.17.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/aopalliance-1.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/guava-11.0.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jersey-json-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/javax.inject-1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/xz-1.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-lang-2.6.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/leveldbjni-all-1.8.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-compress-1.4.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jersey-client-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jersey-guice-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jettison-1.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-codec-1.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/protobuf-java-2.5.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/guice-3.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/asm-3.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/activation-1.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jackson-xc-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jetty-util-6.1.26.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/stax-api-1.0-2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jersey-core-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/netty-3.6.2.Final.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/jackson-jaxrs-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/lib/commons-collections-3.2.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-resourcemanager-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-client-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-nodemanager-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-tests-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-common-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-web-proxy-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-api-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-sharedcachemanager-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-common-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-registry-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-applications-unmanaged-am-launcher-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-server-applicationhistoryservice-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/yarn/hadoop-yarn-applications-distributedshell-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/paranamer-2.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/jackson-mapper-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/guice-servlet-3.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/jackson-core-asl-1.9.13.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/commons-io-2.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/jersey-server-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/log4j-1.2.17.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/aopalliance-1.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/javax.inject-1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/xz-1.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/leveldbjni-all-1.8.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/commons-compress-1.4.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/jersey-guice-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/hadoop-annotations-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/protobuf-java-2.5.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/guice-3.0.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/asm-3.2.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/avro-1.7.4.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/jersey-core-1.9.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/junit-4.11.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/netty-3.6.2.Final.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/hamcrest-core-1.3.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/lib/snappy-java-1.0.4.1.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-app-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.7.5-tests.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-common-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-shuffle-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-core-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-jobclient-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-client-hs-plugins-2.7.5.jar:/home/hadoop/apps/hadoop-2.7.5/contrib/capacity-scheduler/*.jar:/home/hadoop/apps/hadoop-2.7.5/contrib/capacity-scheduler/*.jar
12 STARTUP_MSG: build = Unknown -r Unknown; compiled by 'root' on 2017-12-24T05:30Z
13 STARTUP_MSG: java = 1.8.0_73
14 ************************************************************/
15 18/03/03 11:13:24 INFO namenode.NameNode: registered UNIX signal handlers for [TERM, HUP, INT]
16 18/03/03 11:13:24 INFO namenode.NameNode: createNameNode [-format]
17 18/03/03 11:13:25 WARN common.Util: Path /home/hadoop/data/hadoopdata/name should be specified as a URI in configuration files. Please update hdfs configuration.
18 18/03/03 11:13:25 WARN common.Util: Path /home/hadoop/data/hadoopdata/name should be specified as a URI in configuration files. Please update hdfs configuration.
19 Formatting using clusterid: CID-5cc0d14d-6100-4a01-b12c-d1ebfdbd8531
20 18/03/03 11:13:25 INFO namenode.FSNamesystem: No KeyProvider found.
21 18/03/03 11:13:25 INFO namenode.FSNamesystem: fsLock is fair: true
22 18/03/03 11:13:25 INFO namenode.FSNamesystem: Detailed lock hold time metrics enabled: false
23 18/03/03 11:13:25 INFO blockmanagement.DatanodeManager: dfs.block.invalidate.limit=1000
24 18/03/03 11:13:25 INFO blockmanagement.DatanodeManager: dfs.namenode.datanode.registration.ip-hostname-check=true
25 18/03/03 11:13:25 INFO blockmanagement.BlockManager: dfs.namenode.startup.delay.block.deletion.sec is set to 000:00:00:00.000
26 18/03/03 11:13:25 INFO blockmanagement.BlockManager: The block deletion will start around 2018 三月 03 11:13:25
27 18/03/03 11:13:25 INFO util.GSet: Computing capacity for map BlocksMap
28 18/03/03 11:13:25 INFO util.GSet: VM type = 64-bit
29 18/03/03 11:13:25 INFO util.GSet: 2.0% max memory 966.7 MB = 19.3 MB
30 18/03/03 11:13:25 INFO util.GSet: capacity = 2^21 = 2097152 entries
31 18/03/03 11:13:25 INFO blockmanagement.BlockManager: dfs.block.access.token.enable=false
32 18/03/03 11:13:25 INFO blockmanagement.BlockManager: defaultReplication = 2
33 18/03/03 11:13:25 INFO blockmanagement.BlockManager: maxReplication = 512
34 18/03/03 11:13:25 INFO blockmanagement.BlockManager: minReplication = 1
35 18/03/03 11:13:25 INFO blockmanagement.BlockManager: maxReplicationStreams = 2
36 18/03/03 11:13:25 INFO blockmanagement.BlockManager: replicationRecheckInterval = 3000
37 18/03/03 11:13:25 INFO blockmanagement.BlockManager: encryptDataTransfer = false
38 18/03/03 11:13:25 INFO blockmanagement.BlockManager: maxNumBlocksToLog = 1000
39 18/03/03 11:13:25 INFO namenode.FSNamesystem: fsOwner = hadoop (auth:SIMPLE)
40 18/03/03 11:13:25 INFO namenode.FSNamesystem: supergroup = supergroup
41 18/03/03 11:13:25 INFO namenode.FSNamesystem: isPermissionEnabled = true
42 18/03/03 11:13:25 INFO namenode.FSNamesystem: HA Enabled: false
43 18/03/03 11:13:25 INFO namenode.FSNamesystem: Append Enabled: true
44 18/03/03 11:13:25 INFO util.GSet: Computing capacity for map INodeMap
45 18/03/03 11:13:25 INFO util.GSet: VM type = 64-bit
46 18/03/03 11:13:25 INFO util.GSet: 1.0% max memory 966.7 MB = 9.7 MB
47 18/03/03 11:13:25 INFO util.GSet: capacity = 2^20 = 1048576 entries
48 18/03/03 11:13:26 INFO namenode.FSDirectory: ACLs enabled? false
49 18/03/03 11:13:26 INFO namenode.FSDirectory: XAttrs enabled? true
50 18/03/03 11:13:26 INFO namenode.FSDirectory: Maximum size of an xattr: 16384
51 18/03/03 11:13:26 INFO namenode.NameNode: Caching file names occuring more than 10 times
52 18/03/03 11:13:26 INFO util.GSet: Computing capacity for map cachedBlocks
53 18/03/03 11:13:26 INFO util.GSet: VM type = 64-bit
54 18/03/03 11:13:26 INFO util.GSet: 0.25% max memory 966.7 MB = 2.4 MB
55 18/03/03 11:13:26 INFO util.GSet: capacity = 2^18 = 262144 entries
56 18/03/03 11:13:26 INFO namenode.FSNamesystem: dfs.namenode.safemode.threshold-pct = 0.9990000128746033
57 18/03/03 11:13:26 INFO namenode.FSNamesystem: dfs.namenode.safemode.min.datanodes = 0
58 18/03/03 11:13:26 INFO namenode.FSNamesystem: dfs.namenode.safemode.extension = 30000
59 18/03/03 11:13:26 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.window.num.buckets = 10
60 18/03/03 11:13:26 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.num.users = 10
61 18/03/03 11:13:26 INFO metrics.TopMetrics: NNTop conf: dfs.namenode.top.windows.minutes = 1,5,25
62 18/03/03 11:13:26 INFO namenode.FSNamesystem: Retry cache on namenode is enabled
63 18/03/03 11:13:26 INFO namenode.FSNamesystem: Retry cache will use 0.03 of total heap and retry cache entry expiry time is 600000 millis
64 18/03/03 11:13:26 INFO util.GSet: Computing capacity for map NameNodeRetryCache
65 18/03/03 11:13:26 INFO util.GSet: VM type = 64-bit
66 18/03/03 11:13:26 INFO util.GSet: 0.029999999329447746% max memory 966.7 MB = 297.0 KB
67 18/03/03 11:13:26 INFO util.GSet: capacity = 2^15 = 32768 entries
68 18/03/03 11:13:26 INFO namenode.FSImage: Allocated new BlockPoolId: BP-269129172-192.168.123.102-1520046806111
69 18/03/03 11:13:26 INFO common.Storage: Storage directory /home/hadoop/data/hadoopdata/name has been successfully formatted.
70 18/03/03 11:13:26 INFO namenode.FSImageFormatProtobuf: Saving image file /home/hadoop/data/hadoopdata/name/current/fsimage.ckpt_0000000000000000000 using no compression
71 18/03/03 11:13:26 INFO namenode.FSImageFormatProtobuf: Image file /home/hadoop/data/hadoopdata/name/current/fsimage.ckpt_0000000000000000000 of size 323 bytes saved in 0 seconds.
72 18/03/03 11:13:26 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
73 18/03/03 11:13:26 INFO util.ExitUtil: Exiting with status 0
74 18/03/03 11:13:26 INFO namenode.NameNode: SHUTDOWN_MSG:
75 /************************************************************
76 SHUTDOWN_MSG: Shutting down NameNode at hadoop1/192.168.123.102
77 ************************************************************/
78 [hadoop@hadoop1 ~]$
启动
启动HDFS
[hadoop@hadoop1 ~]$ start-dfs.sh
Starting namenodes on [hadoop1]
hadoop1: starting namenode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-namenode-hadoop1.out
hadoop3: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop3.out
hadoop2: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop2.out
hadoop4: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop4.out
hadoop1: starting datanode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-datanode-hadoop1.out
Starting secondary namenodes [hadoop3]
hadoop3: starting secondarynamenode, logging to /home/hadoop/apps/hadoop-2.7.5/logs/hadoop-hadoop-secondarynamenode-hadoop3.out
[hadoop@hadoop1 ~]$
启动YARN
[hadoop@hadoop4 ~]$ start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-resourcemanager-hadoop4.out
hadoop2: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop2.out
hadoop3: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop3.out
hadoop4: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop4.out
hadoop1: starting nodemanager, logging to /home/hadoop/apps/hadoop-2.7.5/logs/yarn-hadoop-nodemanager-hadoop1.out
[hadoop@hadoop4 ~]$
查看服务器进程
Hadoop1
Hadoop2
Hadoop3
Hadoop4
启动web界面
HDFS 界面
单击DataNodes 可以看到另外四个节点
Yarn 界面
简单使用
创建文件夹
在HDFS上创建一个文件夹/test/input
[hadoop@hadoop1 ~]$ hadoop fs -mkdir -p /test/input
查看创建的文件夹
[hadoop@hadoop1 ~]$ hadoop fs -ls /
Found 1 items
drwxr-xr-x - hadoop supergroup 0 2018-03-03 11:33 /test
[hadoop@hadoop1 ~]$ hadoop fs -ls /test
Found 1 items
drwxr-xr-x - hadoop supergroup 0 2018-03-03 11:33 /test/input
[hadoop@hadoop1 ~]$
上传文件
创建一个文件为words.txt
[hadoop@hadoop1 ~]$ vi words.txt
上传文件
[hadoop@hadoop1 ~]$ hadoop fs -put ~/words.txt /test/input
查看是否上传成功
[hadoop@hadoop1 ~]$ hadoop fs -ls /test/input
Found 1 items
-rw-r--r-- 2 hadoop supergroup 39 2018-03-03 11:37 /test/input/words.txt
[hadoop@hadoop1 ~]$
下载文件
把刚刚上传的文件下载到/data文件夹中
[hadoop@hadoop1 ~]$ hadoop fs -get /test/input/words.txt ~/data
查看是否下载成功
[hadoop@hadoop1 ~]$ ls data
hadoopdata words.txt
[hadoop@hadoop1 ~]$
运行一个mapreduce的例子程序：wordcount
[hadoop@hadoop1 ~]$ hadoop jar ~/apps/hadoop-2.7.5/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.5.jar wordcount /test/input /test/output
在yarn web 界面查看
查看相关结果
[hadoop@hadoop1 ~]$ hadoop fs -ls /test/output
Found 2 items
-rw-r--r-- 2 hadoop supergroup 0 2018-03-03 11:42 /test/output/_SUCCESS
-rw-r--r-- 2 hadoop supergroup 35 2018-03-03 11:42 /test/output/part-r-00000
[hadoop@hadoop1 ~]$ hadoop fs -cat /test/output/part-r-00000
hello 3
lisi 1
wangwu 1
zhangsan 1
[hadoop@hadoop1 ~]$
结语
我是小小，本篇已经结束，我们下期再见。你若不在，我一直在，你若在，我将会一直在，我将会永远的等你，我还是那个小小。
-- 小小 做于 2020 年 09 月 20 日
小明菜市场
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