前提：已經通過上一篇的環境配置好了zookeeper環境

1 叢集規劃

2 HDFS HA

2.1 vi hdfs-core.xml

<configuration>

    <property>
        <name>dfs.replication</name>
        <value>2</value>
 

    </property>

    <property>
      <name>dfs.nameservices</name>
      <value>ns</value>
    </property>

    <property>
      <name>dfs.ha.namenodes.ns</name>
      <value>nn1,nn2</value>
    </property>

    <property>
 

      <name>dfs.namenode.rpc-address.ns.nn1</name>
      <value>bigdata01.com:8020</value>
    </property>

    <property>
      <name>dfs.namenode.rpc-address.ns.nn2</name>
      <value>bigdata02.com:8020</value>
    </property>

    <property>
      <name>dfs.namenode.http-address.ns.nn1</name>
      <value>bigdata01.com:50070</value>
    </property>

    <property>
      <name>dfs.namenode.http-address.ns.nn2</name>
      <value>bigdata02.com:50070</value>
    </property>

    <property>
        <name>dfs.permissions.enabled</name>
        <value>false</value>
    </property>

    <property>
      <name>dfs.namenode.shared.edits.dir</name>
      <value>qjournal://bigdata01.com:8485;bigdata02.com:8485;bigdata03.com:8485/ns</value>
    </property>

    <property>
      <name>dfs.journalnode.edits.dir</name>
      <value>/opt/modules/hadoop-2.5.0/data/dfs/jn</value>
    </property>

    <property>
      <name>dfs.client.failover.proxy.provider.ns</name>
      <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</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/kfk/.ssh/id_rsa</value>
    </property>

    <property>
      <name>dfs.ha.automatic-failover.enabled.ns</name>
      <value>true</value>
    </property>
</configuration>

2.2 vi core-site.xml

    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://ns</value>
    </property>

    <property>
        <name>hadoop.http.staticuser.user</name>
        <value>kfk</value>
    </property>

    <property>
       <name>ha.zookeeper.quorum</name>
       <value>bigdata01.com:2181,bigdata02.com:2181,bigdata03.com:2181</value>
    </property>


    <property>
        <name>hadoop.tmp.dir</name>
        <value>/opt/modules/hadoop-2.5.0/data/tmp</value>
    </property>

2.3 分發hdfs-site.xml 和core-site.xml 到其餘機器中

2.4 啟動HA

First Step:

開啟hadoopHA的初始化
1. 在各個節點上啟動journalnode

sbin/hadoop-daemon.sh start journalnode 

1. 在[nn1]上，對其進行格式化，並啟動

bin/hdfs namenode -format
sbin/hadoop-daemon.sh start namenode

1. [nn2]中同步nn1的元資料

bin/hdfs namenode -bootstrapStandby

1. 啟動nn2

sbin/hadoop-daemon.sh start namenode

1. 將nn1切換成Active

bin/hdfs haadmin -transitionToActive nn1

1. 啟動所有節點的datanode

sbin/hadoop-daemons.sh start datanode

Second Step:

故障自動轉移
1. 先關閉所有的hdfs服務

sbin/stop-dfs.sh

1. 啟動zookeper叢集

#所有的機器都要執行
bin/zkServer.sh

1. 初始化HA在zookeeper中的狀態

bin/hdfs zkfc -formatZK

1. 啟動hdfs服務

sbin/start-dfs.sh

1. 啟動DFSZK服務

sbin/hadoop-daemon.sh start zkfc

3 yarn HA

3.1 vi yarn-site.xml

<configuration>

    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>

    <property>
        <name>yarn.log-aggregation-enable</name>
        <value>true</value> 
    </property>

    <property>
        <name>yarn.log-aggregation.retain-seconds</name>
        <value>10000</value> 
    </property>

    <property>
       <name>yarn.resourcemanager.ha.enabled</name>
       <value>true</value>
     </property>

     <property>
       <name>yarn.resourcemanager.cluster-id</name>
       <value>cluster1</value>
     </property>

     <property>
       <name>yarn.resourcemanager.ha.rm-ids</name>
       <value>rm1,rm2</value>
     </property>

     <property>
       <name>yarn.resourcemanager.hostname.rm1</name>
       <value>bigdata01.com</value>
     </property>
     <property>
       <name>yarn.resourcemanager.hostname.rm2</name>
       <value>bigdata02.com</value>
     </property>

     <property>
       <name>yarn.resourcemanager.zk-address</name>
       <value>bigdata01.com:2181,bigdata01.com:2181,bigdata01.com:2181</value>
     </property>

     <property>
       <name>yarn.resourcemanager.recovery.enabled</name>
       <value>true</value>
     </property>

      <property>
       <name>yarn.resourcemanager.store.class</name>
       <value>org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore</value>
     </property>

</configuration>

3.2 分發到其他機器

3.3 啟動

1. 啟動resourcemanager
2. 啟動nodemanager
3. 測試mapreduce wordcount