HadoopHA模式（由于Hadoop的HA模式是在Hadoop完全分布式基础上，利用zookeeper等协调工具配置的高可用的Hadoop集群模式）

|--------|-------|------------------------------------------------------------------------------------------------------|
| 主机名 | IP地址 | 相关进程 |
| master | 根据自己的 | NameNode,DataNode, DFSZKFailoverController, QuorumPeerMain,JournalNode, ResourceManager,NodeMananger |
| slave1 | 根据自己的 | NameNode,DataNode, DFSZKFailoverController, QuorumPeerMain,JournalNode, ResourceManager,NodeMananger |
| slave2 | 根据自己的 | DataNode, NodeMananger, QuorumPeerMain, JournalNode |
[HadoopHA模式搭建规划]

1.前期准备

1.1.hadoop-3.1.3.tar.gz，jdk-8u212-linux-x64.tar.gz，apache-zookeeper-3.5.7-bin.tar.gz三个包提取码：k5y6

2.解压安装包，配置环境变量

tar -zxf tar包 -C 指定目录

解压后

apache-zookeeper-3.5.7-bin名字好长不太习惯可以用mv改名

或者ln -s 软链接

vim /etc/profile配置环境变量，source /etc/profile使环境变量生效

验证

hadoop version

java -version

3. 将三个节点分别命名为master、slave1、slave2并做免密登录

修改主机名，断开重连

hostnamectl set-hostname 主机名

免密在前面Hadoop完全分布式搭建说过，这里不再赘述

4.搭建zookeeper集群

cd /opt/module/zookeeper/conf

cp zoo_sample.cfg zoo.cfg

编辑zoo.cfg新增下列配置

根据配置的路径新建zkdata，zkdatalog目录。然后到zkdata目录中可以touch新建一个文件myid，也可以直接echo写入为1，另外slave1，salve2分别对应2，3。

5.分发解压后的java，/etc/profile,zookeeper修改myid为2，3

scp -r /opt/module/jdk1.8.0_212/ slave1:/opt/module/

scp -r /opt/module/jdk1.8.0_212/ slave2:/opt/module/

scp /etc/profile slave1:/etc/profile

scp /etc/profile slave2:/etc/profile（不要忘记source）

scp -r /opt/module/zookeeper/ slave1:/opt/module/

scp -r /opt/module/zookeeper/ slave2:/opt/module/

6.启动zookeeper

zkServer.sh start

查看状态

zkServer.sh status

cd /opt/module/hadoop-3.1.3/etc/hadoop

vim core-site.xml

<property>
  <name>fs.defaultFS</name>
  <value>hdfs://cluster</value>
  <description>The name of the default file system.  A URI whose
  scheme and authority determine the FileSystem implementation.  The
  uri's scheme determines the config property (fs.SCHEME.impl) naming
  the FileSystem implementation class.  The uri's authority is used to
  determine the host, port, etc. for a filesystem.</description>
</property>
<property>
  <name>hadoop.tmp.dir</name>
  <value>/opt/module/hadoop-3.1.3/tmpdir</value>
  <description>A base for other temporary directories.</description>
</property>
<property>
  <name>ha.zookeeper.quorum</name>
<value>master:2181,slave1:2181,slave2:2181</value>
  <description>
    A list of ZooKeeper server addresses, separated by commas, that are
    to be used by the ZKFailoverController in automatic failover.
  </description>
</property>

vim hdfs-site.xml

<property>
  <name>dfs.replication</name>
  <value>3</value>
  <description>Default block replication.
  The actual number of replications can be specified when the file is created.
  The default is used if replication is not specified in create time.
  </description>
</property>
<property>
  <name>dfs.nameservices</name>
  <value>cluster</value>
  <description>
    Comma-separated list of nameservices.
  </description>
</property>
<property>
  <name>dfs.ha.namenodes.cluster</name>
  <value>nn1,nn2</value>
  <description>
The prefix for a given nameservice, contains a comma-separated
    list of namenodes for a given nameservice (eg EXAMPLENAMESERVICE).

    Unique identifiers for each NameNode in the nameservice, delimited by
    commas. This will be used by DataNodes to determine all the NameNodes
    in the cluster. For example, if you used Ἶ@~\myclusterἾ@~] as  
thh
e nameservice
    ID previously, and you wanted to use Ἶ@~\nn1Ἶ@~] and Ἶ@~\nn22
Ἶ@@
~] as the individual
    IDs of the NameNodes, you would configure a property
    dfs.ha.namenodes.mycluster, and its value "nn1,nn2".
  </description>
</property>
  <property>
    <name>dfs.namenode.rpc-address.cluster.nn1</name>
    <value>master:8020</value>
    <description>
      A comma separated list of auxiliary ports for the NameNode to listen on.
      This allows exposing multiple NN addresses to clients.
      Particularly, it is used to enforce different SASL levels on different ports.
      Empty list indicates that auxiliary ports are disabled.
    </description>
  </property>
  <property>
    <name>dfs.namenode.rpc-address.cluster.nn2</name>
    <value>slave1:8020</value>
    <description>
      A comma separated list of auxiliary ports for the NameNode to listen on.
      This allows exposing multiple NN addresses to clients.
      Particularly, it is used to enforce different SASL levels on different ports.
      Empty list indicates that auxiliary ports are disabled.
    </description>
  </property>
<property>
  <name>dfs.namenode.http-address.cluster.nn1</name>
  <value>master:9870</value>
  <description>
    The address and the base port where the dfs namenode web ui will listen on.
  </description>
</property>
<property>
  <name>dfs.namenode.http-address.cluster.nn2</name>
  <value>slave1:9870</value>
  <description>
    The address and the base port where the dfs namenode web ui will listen on.
  </description>
</property>
<property>
  <name>dfs.namenode.shared.edits.dir</name>
  <value>qjournal://master:8485;slave1:8485;slave2:8485/cluster</value>
  <description>A directory on shared storage between the multiple namenodes
  in an HA cluster. This directory will be written by the active and read
  by the standby in order to keep the namespaces synchronized. This directory
  does not need to be listed in dfs.namenode.edits.dir above. It should be
  left empty in a non-HA cluster.
  </description>
</property>
<property>
  <name>dfs.client.failover.proxy.provider.cluster</name>
  <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value>
  <description>
    The prefix (plus a required nameservice ID) for the class name of the
    configured Failover proxy provider for the host.  For more detailed
    information, please consult the "Configuration Details" section of
    the HDFS High Availability documentation.
  </description>
</property>
<property>
<name>dfs.ha.automatic-failover.enabled</name>
  <value>true</value>
  <description>
    Whether automatic failover is enabled. See the HDFS High
    Availability documentation for details on automatic HA
    configuration.
  </description>
</property>
<property>
  <name>dfs.ha.fencing.methods</name>
  <value>shell(/bin/true)</value>
  <description>
    A list of scripts or Java classes which will be used to fence
    the Active NameNode during a failover.  See the HDFS High
    Availability documentation for details on automatic HA
    configuration.
  </description>
</property>

vim yarn-site.xml

 <property>
    <description>A comma separated list of services where service name should only
      contain a-zA-Z0-9_ and can not start with numbers</description>
    <name>yarn.nodemanager.aux-services</name>
    <value>mapreduce_shuffle</value>
  </property>
<property>
    <name>yarn.resourcemanager.ha.enabled</name>
    <value>true</value>
  </property>
  <property>
    <description>Name of the cluster. In a HA setting,
      this is used to ensure the RM participates in leader
      election for this cluster and ensures it does not affect
      other clusters</description>
    <name>yarn.resourcemanager.cluster-id</name>
    <value>yarn-cluster</value>
  </property>
  <property>
    <description>The list of RM nodes in the cluster when HA is
      enabled. See description of yarn.resourcemanager.ha
      .enabled for full details on how this is used.</description>
    <name>yarn.resourcemanager.ha.rm-ids</name>
    <value>rm1,rm2</value>
  </property>
  <property>
    <description>The hostname of the RM.</description>
    <name>yarn.resourcemanager.hostname.rm1</name>
  <value>master</value>
  </property>
  <property>
    <description>The hostname of the RM.</description>
    <name>yarn.resourcemanager.hostname.rm2</name>
    <value>slave1</value>
  </property>
  <property>
    <description>
      The http address of the RM web application.
      If only a host is provided as the value,
      the webapp will be served on a random port.
    </description>
    <name>yarn.resourcemanager.webapp.address.rm1</name>
    <value>master:8088</value>
  </property>
  <property>
    <description>
      The http address of the RM web application.
      If only a host is provided as the value,
      the webapp will be served on a random port.
    </description>
    <name>yarn.resourcemanager.webapp.address.rm2</name>
    <value>slave1:8088</value>
  </property>
<property>
    <name>yarn.resourcemanager.zk-address</name>
    <value>master:2181,slave1:2181,slave2:2181</value>
  </property>