基于Cloudera CDH5 Beta2的QJM HA配置

准备：
配置 最低版本jdk 1.7.0.45 以上，
软件下载：http://archive.cloudera.com/cdh5/cdh/5/
系统目前支持64位 我用的是Centos 6.5
配置环境
/etc/profile root用户下
export JAVA_HOME=/usr/java/jdk1.7.0_45
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export HADOOP_HOME=/usr/hadoop/chd5
export HADOOP_PID_DIR=/usr/hadoop/hadoop_pid_dir
export HADOOP_MAPRED_HOME=${HADOOP_HOME}
export HADOOP_COMMON_HOME=${HADOOP_HOME}
export HADOOP_HDFS_HOME=${HADOOP_HOME}
export YARN_HOME=${HADOOP_HOME}
export HADOOP_YARN_HOME=${HADOOP_HOME}
export HADOOP_CONF_DIR=${HADOOP_HOME}/etc/hadoop
export HDFS_CONF_DIR=${HADOOP_HOME}/etc/hadoop
export YARN_CONF_DIR=${HADOOP_HOME}/etc/hadoop
export HADOOP_COMMON_LIB_NATIVE_DIR=/usr/hadoop/chd5
export ZOOKEEPER_HOME=/usr/hadoop/zookeeper
export PATH=${JAVA_HOME}/bin:${ZOOKEEPER_HOME}/bin:$PATH
source /etc/profile重启变量设置生效
角色分配：
master：192.168.1.10 角色：namenode JournalNode
master2:192.168.1.9  角色：namenode JournalNode
slave1:192.168.1.11  角色 ：datanode JournalNode
slave2:192.168.1.12  角色 datanode
slave3:192.168.1.13  角色 datanode
core-site.xml配置》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://cluster</value>
／＊＊fs.defaultFS的值表示hdfs路径的逻辑名称。因为我们会启动2个NameNode，每个NameNode的位置不一样，那么切换后，
用户也要修改代码，很麻烦，因此使用一个逻辑路径，用户就可以不必担心NameNode切换带来的路径不一致问题了。＊＊／

</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/hadoop/tmp</value>//在usr/hadoop目录下创建文件夹 tmp
<description>A base for other temporary directories.</description>
</property>
<property>
<name>dfs.name.dir</name>
<value>/usr/hadoop/hdfs/name</value>//在Hadoop目录下创建文件夹hdfs及子目录 data和name
</property>
<property>
<name>fs.trash.interval</name>
<value>10080</value>
</property>
<property>
<name>fs.trash.checkpoint.interval</name>
<value>10080</value>
</property>
<property>
<name>topology.script.file.name</name>
<value>/usr/hadoop/chd5/etc/hadoop/rack.py</value>  //rack.py是机架感知程序
</property>
<property>
<name>topology.script.number.args</name>
<value>6</value>
</property>
<property>
<name>hadoop.native.lib</name>
<value>false</value>
<description>Should native hadoop libraries, if present, be used.</description>
</property>
<property>
<name>hadoop.security.group.mapping</name>
<value>org.apache.hadoop.security.JniBasedUnixGroupsMappingWithFallback</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配置》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
<configuration>
<property>
<name>dfs.replication</name>
<value>3</value>
</property>
<property>
<name>dfs.blocksize</name>
<value>16m</value>
</property>

<property>
<name>dfs.data.dir</name>
<value>/usr/hadoop/hdfs/data</value>
</property>
<property>
<name>dfs.nameservices</name>
<value>cluster</value>
</property>
<property>
<name>dfs.ha.namenodes.cluster</name>
<value>master,master2</value>
</property>
<property>
<name>dfs.namenode.rpc-address.cluster.master</name>
<value>master:9000</value>
</property>
<property>
<name>dfs.namenode.rpc-address.cluster.master2</name>
<value>master2:9000</value>
</property>
<property>
<name>dfs.namenode.http-address.cluster.master</name>
<value>master:50070</value>
</property>
<property>
<name>dfs.namenode.http-address.cluster.master2</name>
<value>master2:50070</value>
</property>

<property>
<name>dfs.namenode.secondary.http-address.cluster.master</name>
<value>master:50090</value>
</property>
<property>
<name>dfs.namenode.secondary.http-address.cluster.master2</name>
<value>master2:50090</value>
</property>
<property>
<name>dfs.namenode.shared.edits.dir</name>
<value>qjournal://master:8485;master2:8485;slave1:8485/cluster</value>
</property>
<property>
<name>dfs.client.failover.proxy.provider.cluster</name>
<value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
</property>
<property>
<name>ha.zookeeper.quorum</name>
<value>master:2181,slave1:2181,slave2:2181,slave3:2181,master2:2181</value>
</property>
<property>
<name>dfs.ha.fencing.methods</name>
<value>sshfence</value>
</property>
<property>
<name>dfs.ha.fencing.ssh.private-key-files</name>
<value>/home/hadoop/.ssh/id_rsa</value>
</property>
<property>
<name>dfs.journalnode.edits.dir</name>
<value>/usr/hadoop/tmp/journal</value>
</property>
<property>
<name>dfs.ha.automatic-failover.enabled</name>
<value>true</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
<property>
<name>dfs.webhdfs.enabled</name>
<value>true</value>
</property>

<property>
<name>dfs.datanode.max.xcievers</name>
<value>1000000</value>
</property>

<property>
<name>dfs.balance.bandwidthPerSec</name>
<value>104857600</value>
<description>
Specifies the maximum amount of bandwidth that each datanode  can utilize for the balancing purpose in   the number of bytes per second.
</description>
</property>
<property>
<name>dfs.hosts.exclude</name>
<value>/usr/hadoop/chd5/etc/hadoop/excludes</value>
<description>
Names a file that contains a list of hosts that are
not permitted to connect to the namenode.  The full pathname of the
file must be specified.  If the value is empty, no hosts are excluded                                                                                    </description>
</property>
</configuration>
mapred-site.xml 配置》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.jobhistory.address</name>
<value>master:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>master:19888</value>
</property>
<property>
<name>mapreduce.output.fileoutputformat.compress</name>
<value>true</value>
</property>
<property>
<name>mapreduce.output.fileoutputformat.compress.type</name>
<value>BLOCK</value>
</property>
<property>
<name>mapreduce.output.fileoutputformat.compress.codec</name>
<value>org.apache.hadoop.io.compress.SnappyCodec</value>
</property>
<property>
<name>mapreduce.map.output.compress</name>
<value>true</value>
</property>
<property>
<name>mapreduce.map.output.compress.codec</name>
<value>org.apache.hadoop.io.compress.SnappyCodec</value>
</property>
</configuration>
yarn-site.xml配置》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
<property>
<name>mapreduce.jobhistory.address</name>
<value>master:10020</value>
</property>
<property>
<name>mapreduce.jobhistory.webapp.address</name>
<value>master:19888</value>
</property>
<property>
<name>mapreduce.output.fileoutputformat.compress</name>
<value>true</value>
</property>
<property>
<name>mapreduce.output.fileoutputformat.compress.type</name>
<value>BLOCK</value>
</property>
<property>
<name>mapreduce.output.fileoutputformat.compress.codec</name>
<value>org.apache.hadoop.io.compress.SnappyCodec</value>
</property>
<property>
<name>mapreduce.map.output.compress</name>
<value>true</value>
</property>
<property>
<name>mapreduce.map.output.compress.codec</name>
<value>org.apache.hadoop.io.compress.SnappyCodec</value>
</property>
</configuration>
rack.py》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
#!/bin/env python

import sys,os,time

pwd = os.path.realpath( __file__ )
rack_file = os.path.dirname(pwd) + "/rack.data"

rack_list = [ l.strip().split() for l in open(rack_file).readlines() if len(l.strip().split()) > 1 ]
rack_map = {}
for item in rack_list:
for host in item[:-1]:
rack_map[host] = item[-1]
rack_map['default'] = 'default' in rack_map and rack_map['default'] or '/default/rack'
rack_result = [av in rack_map and rack_map[av] or rack_map['default'] for av in sys.argv[1:]]
#print rack_map, rack_result
print ' '.join( rack_result )

f = open('/tmp/rack.log','a+')
f.writelines( "[%s] %sn" % (time.strftime("%F %T"),str(sys.argv)))
f.close()
zookeeper 中zoo.cfg配置》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》
在zookeeper文件夹下创建data目录用于存放数据,并在data 目录下创建文件myid 根据server id 的不同写入1或2或3或4或5和
和配置里的server.1，server.2……一致
# The number of milliseconds of each tick
tickTime=2000
# The number of ticks that the initial
# synchronization phase can take
initLimit=10
# The number of ticks that can pass between
# sending a request and getting an acknowledgement
syncLimit=5
# the directory where the snapshot is stored.
# do not use /tmp for storage, /tmp here is just
# example sakes.
dataDir=/usr/hadoop/zookeeper/data
# the port at which the clients will connect
clientPort=2181
server.1=master:2888:3888
server.2=master2:2888:3888
server.3=slave1:2888:3888
server.4=slave2:2888:3888
server.5=slave3:2888:3888
#
# Be sure to read the maintenance section of the
# administrator guide before turning on autopurge.
#
# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance #
# The number of snapshots to retain in dataDir
#autopurge.snapRetainCount=3
# Purge task interval in hours
# Set to "0" to disable auto purge feature
#autopurge.purgeInterval=1

以下命令严格注意执行顺序，不能颠倒！

1、在master、master2,slave1上，执行命令 hadoop-daemon.sh start journalnode

2、在5个节点启动zookeeper 执行命令：zkServer.sh start命令

3、在master执行命令 hdfs namenode –format

在master执行命令 hadoop-daemon.sh start namenode

4、在master2执行命令 hdfs namenode -bootstrapStandby

在master2执行命令 hadoop-daemon.sh start namenode

此时访问192.168.1.9:50070 和192.168.1.10:50070都是standy状态

5、格式化zookeeper HA配置文件执行命令

hdfs zkfc -formatZK

6、在任意一个namenode节点执行start.sh命令 其中一个namenode的standy状态会变成active，另一个是standy状态

如有不同意见或看法望大家留下宝贵意见，及时修改，共同进步。