hadoop Federation搭建

组网说明：

hadoop1.localdomain    192.168.11.81（namenode）

hadoop2.localdomain    192.168.11.82（namenode）

hadoop3.localdomain    192.168.11.83(datanode)

hadoop4.localdomain    192.168.11.84(datanode)

hadoop5.localdomain    192.168.11.85(datanode)

第一步：卸载openjdk

rpm -qa |grep java

#查看已经安装的与java相关的包

rpm -e java-1.7.0-openjdk-1.7.0.45-2.4.3.3.el6.x86_64

rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.66.1.13.0.el6.x86_64

rpm -e tzdata-java-2013g-1.el6.noarch

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第二步：禁用IPV6

echo net.ipv6.conf.all.disable_ipv6=1 >>/etc/sysctl.conf

echo "alias net-pf-10 off" >>/etc/modprobe.d/dist.conf

echo "alias ipv6 off" >>/etc/modprobe.d/dist.conf

reboot

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第三步：解压hadoop压缩包

把压缩包导入到/usr目录

cd /usr

tar -zxvf hadoop--642.4.0.tar.gz

把目录重命名为hadoop

mv hadoop--642.4.0 hadoop

安装jdk1.7,把安装包导入到/usr目录

cd /usr

rpm -ivh jdk-7u71-linux-x64.rpm

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第四步：设置JAVA&HADOOP环境变量

vi /etc/profile

#set java environment

export JAVA_HOME=/usr/java/jdk1.7.0_71/

export HADOOP_PREFIX=/usr/hadoop/

export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar

export PATH=$PATH:$JAVA_HOME/bin

#set hadoop environment

export HADOOP_HOME=/usr/hadoop/

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

#使配置生效

source /etc/profile

或者重启服务器，也会重新加载该配置

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第五步：创建hdfs需要的目录

mkdir -p /home/hadoop/dfs/name

mkdir -p /home/hadoop/dfs/data

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第六步：java enviromnet追加到hadoop环境变量配置文件中

echo export JAVA_HOME=/usr/java/jdk1.7.0_71/ >>/usr/hadoop/etc/hadoop/hadoop-env.sh

echo export JAVA_HOME=/usr/java/jdk1.7.0_71/ >>/usr/hadoop/etc/hadoop/yarn-env.sh

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第七步：免ssh key,可以只在namenode上，因为一般情况下，由namenode控制datanode

略，查看相关配置手册

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第八步：编辑datanode配置文件，只在namenode上

[root@hadoop1 hadoop]# pwd

/usr/hadoop/etc/hadoop

[root@hadoop1 hadoop]# more slaves 

hadoop3.localdomain

hadoop4.localdomain

hadoop5.localdomain

########################################

[root@hadoop1 hadoop]# more core-site.xml 

<configuration>

  <property>

    <name>fs.defaultFS</name>

    <value>hdfs://hadoop1.localdomain:8020</value>

  </property>

#

# <property>

#    <name>fs.defaultFS</name>

#    <value>viewfs://nsX</value>

#  </property>

#

 <property>

    <name>io.file.buffer.size</name>

    <value>131072</value>

  </property>

  <property>

    <name>hadoop.tmp.dir</name>

    <value>file:/home/hadoop/tmp</value>

  </property>

  <property>

    <name>hadoop.proxyuser.hadoop.hosts</name>

    <value>*</value>

  </property>

  <property>

    <name>hadoop.proxyuser.hadoop.groups</name>

    <value>*</value>

  </property>

</configuration>

###########################################

hdfs-site.xml 

<property>

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

    <value>/home/hadoop/dfs/name</value>

  </property>

  <property>

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

    <value>/home/hadoop/dfs/data</value>

  </property>

  <property>

    <name>dfs.replication</name>

    <value>3</value>

  </property>

  <property>

    <name>dfs.webhdfs.enabled</name>

    <value>true</value>

  </property>

###############################

  <property>

   <name>dfs.federation.nameservices</name>

    <value>ns1,ns2</value>

  </property>

  <property>

   <name>dfs.namenode.rpc-address.ns1</name>

   <value>hadoop1.localdomain:8020</value>

  </property>

  <property>

   <name>dfs.namenode.http-address.ns1</name>

   <value>hadoop1.localdomain:50070</value>

  </property>

  <property>

   <name>dfs.namenode.secondaryhttp-address.ns1</name>

   <value>hadoop1.localdomain:50080</value>

  </property>

  <property>

   <name>dfs.namenode.rpc-address.ns2</name>

   <value>hadoop2.localdomain:8020</value>

  </property>

  <property>

   <name>dfs.namenode.http-address.ns2</name>

   <value>hadoop2.localdomain:50070</value>

  </property>

  <property>

   <name>dfs.namenode.secondaryhttp-address.ns2</name>

   <value>hadoop2.localdomain:50080</value>

  </property>

#################################

mapred-site.xml

<property>

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

    <value>yarn</value>

  </property>

  <property>

    <name>mapreduce.jobhistory.address</name>

    <value>hadoop1.localdomain:10020</value>

  </property>

  <property>

    <name>mapreduce.jobhistory.webapp.address</name>

    <value>hadoop1.localdomain:19888</value>

  </property>

###########################

yarn-site.xml 

<property>

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

    <value>mapreduce_shuffle</value>

  </property>

  <property>

    <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name>

    <value>org.apache.hadoop.mapred.ShuffleHandler</value>

  </property>

  <property>

    <name>yarn.resourcemanager.address</name>

    <value>hadoop1.localdomain:8032</value>

  </property>

  <property>

    <name>yarn.resourcemanager.scheduler.address</name>

    <value>hadoop1.localdomain:8030</value>

  </property>

  <property>

    <name>yarn.resourcemanager.resource-tracker.address</name>

    <value>hadoop1.localdomain:8031</value>

  </property>

  <property>

    <name>yarn.resourcemanager.admin.address</name>

    <value>hadoop1.localdomain:8033</value>

  </property>

  <property>

    <name>yarn.resourcemanager.webapp.address</name>

    <value>hadoop1.localdomain:8088</value>

  </property>

#############################

1、在hadoop1上，把hadoop所在文件夹拷贝到其他节点上，不用更改配置

scp /usr/hadoop hadoop2:/usr/

scp /usr/hadoop hadoop3:/usr/

scp /usr/hadoop hadoop4:/usr/

scp /usr/hadoop hadoop5:/usr/

2、格式化namenode，两个namenode都要格式化，切clusterid

hdfs namenode -format -clusterId MyHadoopCluster

MyHadoopCluster是以字符串的形式

3、每次格式化namenode之前，要删除缓存

rm -rf /home/hadoop/dfs/data/*

rm -rf /home/hadoop/dfs/name/*

4、

开启

start-all.sh

关闭

stop-all.sh

访问方式：

http://hadoop1.localdomain:50070/dfsclusterhealth.jsp

http://hadoop1.localdomain:50070/dfshealth.jsp

http://hadoop1.localdomain:50070/dfshealth.html#tab-overview

http://hadoop1.localdomain:8088/cluster/nodes

参考阅读：

http://hadoop.apache.org/docs/r2.2.0/hadoop-project-dist/hadoop-hdfs/Federation.html

http://zh.hortonworks.com/blog/an-introduction-to-hdfs-federation/