hadoop-HA高可用集群部署

红太狼 2021-09-20 01:30 399阅读 0赞

# HA 高可用集群部署 #

节点设置，4个虚拟机，且完成SSH免密钥登陆，jdk安装

**Active NameNode :** 一个集群只有一个Active，接受客户端的读写请求，记录edits日志（元数据）。

**StandbyNameNode :** 一个集群中可能有多个Standby。合并edits和fsimage文件，从而更新fsimage。等待 ActiveNameNode的死亡。

**JournalNode：** 共享edits日志文件。当ANN写入一条日志的同时，往JournalNode集群中也写入一条。当它接受一条日志，同时通知StandbyNamenode获取。

**DataNode:** 保存和管理block。并且往两种NameNode同时汇报block的位置信息。

**Zookeeper：** 它是负责选举算法。选举一个Namenode的状态为Active。同时记录每个Namenode的运行信息。

**ZKFC:** 监控各自的NameNode（每一个NameNode一定有一个与之对应的ZKFC）。负责NameNode的状态切换。借助ssh服务来切换NameNode的状态（一定要配置SSH服务的免密钥）。

# zookeeper集群 #

## 配置环境变量 ##

export HADOOP_HOME=/opt/hadoop-2.6.5
    export ZOOKEEPER_HOME=/opt/zkServ
    export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin:$ZOOKEEPER_HOME/bin

## 修改配置文件 ##

1.配置zoo.cfg

cd /opt/zkServ/conf
    复制文件
    cp zoo_sample.cfg ./zoo.cfg
    配置文件
    vi zoo.cfg
    
    
    # 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=/opt/zk_data
    # the port at which the clients will connect
    clientPort=2181
    # the maximum number of client connections.
    # increase this if you need to handle more clients
    #maxClientCnxns=60
    #
    # 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
    server.1=192.168.200.22:2888:3888
    server.2=192.168.200.23:2888:3888
    server.3=192.168.200.24:2888:3888

2.配置myid

mkdir /opt/zk_data
    创建myid文件
    写入server.1 对应的数字
    例如 
    	1

3.分发

scp -r zkServ/ bd004:/opt/
    
    find / -name zkServ
    
    分别配置环境变量

4.zk启动测试

zkServer.sh  start

## 配置hadoop ##

#### hdfs-site.xml ####

<property>
      <name>dfs.nameservices</name>
      <value>mycluster</value>
    </property>
    <property>
      <name>dfs.ha.namenodes.mycluster</name>
      <value>nn1,nn2</value>
    </property>
    <property>
      <name>dfs.namenode.rpc-address.mycluster.nn1</name>
      <value>node01:8020</value>
    </property>
    <property>
      <name>dfs.namenode.rpc-address.mycluster.nn2</name>
      <value>node02:8020</value>
    </property>
    <property>
      <name>dfs.namenode.http-address.mycluster.nn1</name>
      <value>node01:50070</value>
    </property>
    <property>
      <name>dfs.namenode.http-address.mycluster.nn2</name>
      <value>node02:50070</value>
    </property>
    
    
    
    
    <property>
      <name>dfs.namenode.shared.edits.dir</name>
      <value>qjournal://node01:8485;node02:8485;node03:8485/mycluster</value>
    </property>
    
    <property>
      <name>dfs.journalnode.edits.dir</name>
      <value>/var/sxt/hadoop/ha/jn</value>
    </property>
    
    
    
    <property>
      <name>dfs.client.failover.proxy.provider.mycluster</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>/root/.ssh/id_dsa</value>
    </property>
    
    <property>
       <name>dfs.ha.automatic-failover.enabled</name>
       <value>true</value>
     </property>

#### **core-site.xml** ####

<property>
      <name>fs.defaultFS</name>
      <value>hdfs://mycluster</value>
     </property>
    
     <property>
       <name>ha.zookeeper.quorum</name>
       <value>node02:2181,node03:2181,node04:2181</value>
     </property>

**修改slaves**

bd002
    bd003
    bd004

#### 配置节点1、2的免密钥 ####

#对自己免密钥
    ssh-keygen  -t dsa -P '' -f ~/.ssh/id_dsa
    cat id_dsa.pub  >> authorized_keys 
    
    #分发
    scp id_dsa.pub  bd002:`pwd`/bd001.pub
    #追加
    cat bd001.pub  >> authorized_keys

分发hadoop

1-->2,3,4
    scp -r  hadoop-HA/ bd002:/opt/

1.启动JNN(节点1,2,3)
    hadoop-daemon.sh start journalnode
    2.格式化(节点1)
    hdfs namenode -format
    启动（节点1），
    hadoop-daemon.sh  start namenode
    3.bd002格式化
    hdfs namenode -bootstrapStandby
    4.格式化zk(节点1)
    hdfs zkfc -formatZK
    
    5.节点1启动
    start-dfs.sh

启动成功

[root@bd001 .ssh]# start-dfs.sh 
    19/06/12 18:25:20 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Starting namenodes on [bd001 bd002]
    bd002: starting namenode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-namenode-bd002.out
    bd001: namenode running as process 3758. Stop it first.
    bd002: starting datanode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-datanode-bd002.out
    bd004: starting datanode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-datanode-bd004.out
    bd003: starting datanode, logging to /opt/hadoop-2.6.5/logs/hadoop-root-datanode-bd003.out
    Starting journal nodes [bd001 bd002 bd003]
    bd002: journalnode running as process 2889. Stop it first.
    bd001: journalnode running as process 3652. Stop it first.
    bd003: journalnode running as process 2151. Stop it first.
    19/06/12 18:25:31 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
    Starting ZK Failover Controllers on NN hosts [bd001 bd002]
    bd002: starting zkfc, logging to /opt/hadoop-2.6.5/logs/hadoop-root-zkfc-bd002.out
    bd001: starting zkfc, logging to /opt/hadoop-2.6.5/logs/hadoop-root-zkfc-bd001.out

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