为已存在的Hadoop集群配置HDFS Federation

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
	<name>dfs.namenode.name.dir</name>
	<value>file:/home/grid/hadoop-2.7.2/hdfs/name</value>
</property>
<property>
	<name>dfs.datanode.data.dir</name>
	<value>file:/home/grid/hadoop-2.7.2/hdfs/data</value>
</property>
<property>
	<name>dfs.replication</name>
	<value>1</value>
</property>
<property>
	<name>dfs.webhdfs.enabled</name>
	<value>true</value>
</property>

<!-- 新增属性 -->
<property>
    <name>dfs.nameservices</name>
    <value>ns1,ns2</value>
</property>
<property>
    <name>dfs.namenode.rpc-address.ns1</name>
    <value>master:9000</value>
</property>
<property>
    <name>dfs.namenode.http-address.ns1</name>
    <value>master:50070</value>
</property>
<property>
    <name>dfs.namenode.secondary.http-address.ns1</name>
    <value>master:9001</value>
</property>
<property>
    <name>dfs.namenode.rpc-address.ns2</name>
    <value>kettle:9000</value>
</property>
<property>
    <name>dfs.namenode.http-address.ns2</name>
    <value>kettle:50070</value>
</property>
<property>
    <name>dfs.namenode.secondary.http-address.ns2</name>
    <value>kettle:9001</value>
</property>
</configuration>

scp hdfs-site.xml slave1:/home/grid/hadoop-2.7.2/etc/hadoop/
scp hdfs-site.xml slave2:/home/grid/hadoop-2.7.2/etc/hadoop/

scp -rp /home/grid/hadoop-2.7.2 kettle:/home/grid/
scp -rp /home/grid/jdk1.7.0_75 kettle:/home/grid/
# 用root执行
scp -p /etc/profile.d/* kettle:/etc/profile.d/

# 在kettle上执行
source /etc/profile
ln -s hadoop-2.7.2 hadoop
$HADOOP_HOME/sbin/hadoop-daemon.sh start namenode
$HADOOP_HOME/sbin/hadoop-daemon.sh start secondarynamenode

# 在集群中任意一台机器上执行均可
$HADOOP_HOME/bin/hdfs dfsadmin -refreshNamenodes slave1:50020
$HADOOP_HOME/bin/hdfs dfsadmin -refreshNamenodes slave2:50020

# 向HDFS上传一个文本文件
hadoop dfs -put /home/grid/hadoop/NOTICE.txt /
# 分别在两台NameNode节点上运行Hadoop自带的例子
# 在master上执行
hadoop jar /home/grid/hadoop-2.7.2/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar wordcount /NOTICE.txt /output
# 在kettle上执行
hadoop jar /home/grid/hadoop-2.7.2/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.2.jar wordcount /NOTICE.txt /output1

hadoop dfs -cat /output/part-r-00000
hadoop dfs -cat /output1/part-r-00000