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概念:
是一个可靠的、可伸缩的、分布式计算的开源软件。
是一个框架,允许跨越计算机集群的大数据及分布式处理,使用简单的编程模型(mapreduce)
可从单台服务器扩展至几千台主机,每个节点提供了计算和存储功能。
不依赖于硬件处理HA,在应用层面实现特性4V:
volumn 体量大
velocity 速度快
variaty 样式多
value 价值密度低模块:
hadoop common 公共类库,支持其他模块
HDFS hadoop distributed file system,hadoop分布式文件系统
Hadoop yarn 作业调度和资源管理框架
hadoop mapreduce 基于yarn系统的大数据集并行处理技术。
主机名称 | IP地址 | 安装节点应用 |
---|---|---|
hadoop-1 | 172.20.2.203 | namenode/datanode/nodemanager |
hadoop-2 | 172.20.2.204 | secondarynode/datanode/nodemanager |
hadoop-3 | 172.20.2.205 | resourcemanager/datanode/nodemanager |
a.配置java环境
yum install java-1.8.0-openjdk.x86_64 java-1.8.0-openjdk-devel -y cat >/etc/profile.d/java.sh<<EOFexport JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.161-3.b14.el6_9.x86_64export CLASSPATH=.:\$JAVA_HOME/jre/lib/rt.jar:\$JAVA_HOME/lib/dt.jar:\$JAVA_HOME/lib/tools.jar export PATH=\$PATH:\$JAVA_HOME/binEOFsource /etc/profile.d/java.sh
b.修改主机名添加hosts
hostname hadoop-1cat >>/etc/hosts<<EOF172.20.2.203 hadoop-1172.20.2.204 hadoop-2172.20.2.205 hadoop-3EOF
c.创建用户及目录
useradd hadoop echo "hadoopwd" |passwd hadoop --stdinmkdir -pv /data/hadoop/hdfs/{nn,snn,dn}chown -R hadoop:hadoop /data/hadoop/hdfs/mkdir -p /var/log/hadoop/yarnmkdir -p /dbapps/hadoop/logschmod g+w /dbapps/hadoop/logs/chown -R hadoop.hadoop /dbapps/hadoop/
d.配置hadoop环境变量
cat>/etc/profile.d/hadoop.sh<<EOFexport HADOOP_PREFIX=/usr/local/hadoopexport PATH=\$PATH:\$HADOOP_PREFIX/bin:\$HADOOP_PREFIX/sbinexport HADOOP_COMMON_HOME=\${HADOOP_PREFIX}export HADOOP_HDFS_HOME=\${HADOOP_PREFIX}export HADOOP_MAPRED_HOME=\${HADOOP_PREFIX}export HADOOP_YARN_HOME=\${HADOOP_PREFIX}EOFsource /etc/profile.d/hadoop.sh
e.下载并解压软件包
mkdir /software cd /software wget -c http://www.apache.org/dyn/closer.cgi/hadoop/common/hadoop-2.7.5/hadoop-2.7.5.tar.gz tar -zxf hadoop-2.6.5.tar.gz -C /usr/localln -sv /usr/local/hadoop-2.6.5/ /usr/local/hadoop chown hadoop.hadoop /usr/local/hadoop-2.6.5/ -R
f.hadoop用户免密钥配置
su - hadoop ssh-keygen -t rsafor num in `seq 1 3`;do ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub hadoop@hadoop-$num;done
配置master节点
hadoop-1节点运行namenode/datanode/nodemanager,修改hadoop-1的hadoop配置文件
core-site.xml
(定义namenode节点)
cat>/usr/local/hadoop/etc/hadoop/core-site.xml <<EOF <?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><configuration><property><name>fs.defaultFS</name><value>hdfs://hadoop-1:8020</value><final>true</final></property></configuration>EOF
hdfs-site.xml
修改replication为data节点数目 (定义secondary节点)
cat >/usr/local/hadoop/etc/hadoop/hdfs-site.xml <<EOF <?xml version="1.0" encoding="UTF-8"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><configuration><property><name>dfs.namenode.secondary.http-address</name><value>hadoop-2:50090</value></property><property><name>dfs.replication</name><value>2</value></property><property><name>dfs.namenode.name.dir</name><value>file:///data/hadoop/hdfs/nn</value></property><property><name>dfs.datanode.data.dir</name><value>file:///data/hadoop/hdfs/dn</value></property><property><name>fs.checkpoint.dir</name><value>file:///data/hadoop/hdfs/snn</value></property><property><name>fs.checkpoint.edits.dir</name><value>file:///data/hadoop/hdfs/snn</value></property></configuration>EOF
添加mapred-site.xml
cat >/usr/local/hadoop/etc/hadoop/mapred-site.xml <<EOF <?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><configuration><property><name>mapreduce.framework.name</name><value>yarn</value></property></configuration>EOF
yarn-site.xml
修改对应values为master的主机名(定义resourcemanager节点)
cat >/usr/local/hadoop/etc/hadoop/yarn-site.xml<<EOF <?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="configuration.xsl"?><configuration><property><name>yarn.resourcemanager.address</name><value>hadoop-3:8032</value></property><property><name>yarn.resourcemanager.scheduler.address</name><value>hadoop-3:8030</value></property><property><name>yarn.resourcemanager.resource-tracker.address</name><value>hadoop-3:8031</value></property><property><name>yarn.resourcemanager.admin.address</name><value>hadoop-3:8033</value></property><property><name>yarn.resourcemanager.webapp.address</name><value>hadoop-3:8088</value></property><property><name>yarn.nodemanager.aux-services</name><value>mapreduce_shuffle</value></property><property><name>yarn.nodemanager.auxservices.mapreduce_shuffle.class</name><value>org.apache.hadoop.mapred.ShuffleHandler</value></property><property><name>yarn.resourcemanager.scheduler.class</name><value>org.apache.hadoop.yarn.server.resourcemanager.scheduler.capacity.CapacityScheduler</value></property></configuration>EOF
slaves
(定义数据节点)
cat >/usr/local/hadoop/etc/hadoop/slaves<<EOF hadoop-1 hadoop-2 hadoop-3 EOF
同样的步骤操作hadoop-2/3,建议将hadoop-1的文件直接分发至hadoop-2/3
在NameNode机器上(hadoop-1)执行格式化:
hdfs namenode -format
在namenode hadoop-1执行start-all.sh
启动服务
在hadoop-3启动resourcemanager服务``
hadoop-2服务查看
hadoop-3服务查看
yarn jar /usr/local/hadoop/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.5.jar pi 2 10
HDFS-NameNode
url:http://172.20.2.203:50070
YARN-ResourceManager
url:http://172.20.2.205:8088
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