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概念:
是一個可靠的、可伸縮的、分布式計算的開源軟件。
是一個框架,允許跨越計算機集群的大數(shù)據(jù)及分布式處理,使用簡單的編程模型(mapreduce)
可從單臺服務(wù)器擴展至幾千臺主機,每個節(jié)點提供了計算和存儲功能。
不依賴于硬件處理HA,在應(yīng)用層面實現(xiàn)特性4V:
volumn 體量大
velocity 速度快
variaty 樣式多
value 價值密度低模塊:
hadoop common 公共類庫,支持其他模塊
HDFS hadoop distributed file system,hadoop分布式文件系統(tǒng)
Hadoop yarn 作業(yè)調(diào)度和資源管理框架
hadoop mapreduce 基于yarn系統(tǒng)的大數(shù)據(jù)集并行處理技術(shù)。
主機名稱 | IP地址 | 安裝節(jié)點應(yīng)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環(huán)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.修改主機名添加hosts
hostname hadoop-1cat >>/etc/hosts<<EOF172.20.2.203 hadoop-1172.20.2.204 hadoop-2172.20.2.205 hadoop-3EOF
c.創(chuàng)建用戶及目錄
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環(huán)境變量
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.下載并解壓軟件包
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用戶免密鑰配置
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節(jié)點
hadoop-1節(jié)點運行namenode/datanode/nodemanager,修改hadoop-1的hadoop配置文件
core-site.xml
(定義namenode節(jié)點)
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為data節(jié)點數(shù)目 (定義secondary節(jié)點)
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
修改對應(yīng)values為master的主機名(定義resourcemanager節(jié)點)
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
(定義數(shù)據(jù)節(jié)點)
cat >/usr/local/hadoop/etc/hadoop/slaves<<EOF hadoop-1 hadoop-2 hadoop-3 EOF
同樣的步驟操作hadoop-2/3,建議將hadoop-1的文件直接分發(fā)至hadoop-2/3
在NameNode機器上(hadoop-1)執(zhí)行格式化:
hdfs namenode -format
在namenode hadoop-1執(zhí)行start-all.sh
啟動服務(wù)
在hadoop-3啟動resourcemanager服務(wù)``
hadoop-2服務(wù)查看
hadoop-3服務(wù)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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