实验一：高可用集群启动
实验任务一：HA的启动
步骤一：启动journalnode守护进程
[hadoop@master hadoop]$ hadoop-daemons.sh start journalnode
master: starting journalnode, logging to /usr/local/src/hadoop/logs/hadoop-root-journalnode-master.out
slave1: starting journalnode, logging to /usr/local/src/hadoop/logs/hadoop-root-journalnode-slave1.out
slave2: starting journalnode, logging to /usr/local/src/hadoop/logs/hadoop-root-journalnode-slave2.out
步骤二：初始化namenode
[hadoop@master ~]$ hdfs namenode -format
步骤三：注册ZNod
[hadoop@master ~]$ hdfs zkfc -formatZK
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:java.library.path=/usr/local/src/hadoop/lib:/usr/local/src/hadoop/lib/native
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:java.io.tmpdir=/tmp
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:java.compiler=<NA>
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:os.name=Linux
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:os.arch=amd64
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:os.version=3.10.0-693.el7.x86_64
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:user.name=root
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:user.home=/root
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Client environment:user.dir=/usr/local/src/hadoop/etc/hadoop
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Initiating client connection, connectString=master:2181,slave1:2181,slave2:2181 sessionTimeout=5000 watcher=org.apache.hadoop.ha.ActiveStandbyElector$WatcherWithClientRef@27ce24aa
20/07/01 17:23:15 INFO zookeeper.ClientCnxn: Opening socket connection to server slave2/192.168.1.8:2181. Will not attempt to authenticate using SASL (unknown error)
20/07/01 17:23:15 INFO zookeeper.ClientCnxn: Socket connection established to slave2/192.168.1.8:2181, initiating session
20/07/01 17:23:15 INFO zookeeper.ClientCnxn: Session establishment complete on server slave2/192.168.1.8:2181, sessionid = 0x373099bfa8c0000, negotiated timeout = 5000
20/07/01 17:23:15 INFO ha.ActiveStandbyElector: Successfully created /hadoop-ha/ns in ZK.
20/07/01 17:23:15 INFO zookeeper.ZooKeeper: Session: 0x373099bfa8c0000 closed
20/07/01 17:23:15 WARN ha.ActiveStandbyElector: Ignoring stale result from old client with sessionId 0x373099bfa8c0000
20/07/01 17:23:15 INFO zookeeper.ClientCnxn: EventThread shut down
步骤四：启动hdfs
[hadoop@master ~]$ start-dfs.sh
Starting namenodes on [master slave1]
master: starting namenode, logging to /usr/local/src/hadoop/logs/hadoop-root-namenode-master.out
slave1: starting namenode, logging to /usr/local/src/hadoop/logs/hadoop-root-namenode-slave1.out
master: starting datanode, logging to /usr/local/src/hadoop/logs/hadoop-root-datanode-master.out
slave1: starting datanode, logging to /usr/local/src/hadoop/logs/hadoop-root-datanode-slave1.out
slave2: starting datanode, logging to /usr/local/src/hadoop/logs/hadoop-root-datanode-slave2.out
Starting journal nodes [master slave1 slave2]
master: journalnode running as process 1787. Stop it first.
slave2: journalnode running as process 1613. Stop it first.
slave1: journalnode running as process 1634. Stop it first.
Starting ZK Failover Controllers on NN hosts [master slave1]
slave1: starting zkfc, logging to /usr/local/src/hadoop/logs/hadoop-root-zkfc-slave1.out
master: starting zkfc, logging to /usr/local/src/hadoop/logs/hadoop-root-zkfc-master.out
步骤五：启动yarn
[hadoop@master ~]$ start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /usr/local/src/hadoop/logs/yarn-root-resourcemanager-master.out
master: starting nodemanager, logging to /usr/local/src/hadoop/logs/yarn-root-nodemanager-master.out
slave1: starting nodemanager, logging to /usr/local/src/hadoop/logs/yarn-root-nodemanager-slave1.out
slave2: starting nodemanager, logging to /usr/local/src/hadoop/logs/yarn-root-nodemanager-slave2.out
步骤六：同步master数据
复制namenode元数据到其它节点(在master节点执行)
[hadoop@master ~]$ scp -r /usr/local/src/hadoop/tmp/hdfs/nn/* slave1:/usr/local/src/hadoop/tmp/hdfs/nn/
[hadoop@master ~]$ scp -r /usr/local/src/hadoop/tmp/hdfs/nn/* slave2:/usr/local/src/hadoop/tmp/hdfs/nn/
步骤七：在slave1上启动resourcemanager和namenode进程
[hadoop@slave1 ~]$ yarn-daemon.sh start resourcemanager
starting resourcemanager, logging to /usr/local/src/hadoop/logs/yarn-root-resourcemanager-slave1.out
[hadoop@slave1 ~]$ hadoop-daemon.sh start namenode
starting namenode, logging to /usr/local/src/hadoop/logs/hadoop-hadoop-namenode-slave1.out
步骤九：启动 MapReduce任务历史服务
[hadoop@master ~]$ yarn-daemon.sh start proxyserver
starting proxyserver, logging to /usr/local/src/hadoop/logs/yarn-root-proxyserver-master.out
[hadoop@master ~]$ mr-jobhistory-daemon.sh start historyserver
starting historyserver, logging to /usr/local/src/hadoop/logs/mapred-root-historyserver-master.out
步骤十：查看端口和进程
[hadoop@master ~]$ jps
[hadoop@slave1 ~]$ jps
[hadoop@slave2 ~]$ jps
master:50070
slave1:50070
master:8088
实验任务二：HA的测试
步骤一：创建一个测试文件
[hadoop@master ~]$ vi a.txt
//内容如下：
Hello World
Hello Hadoop
步骤二：在hdfs创建文件夹
[hadoop@master ~]# hadoop fs -mkdir /input
步骤三：将a.txt传输到input上
[hadoop@master ~]$ hadoop fs -put ~/a.txt /input
步骤四：进入到jar包测试文件目录下
[hadoop@master ~]$ cd /usr/local/src/hadoop/share/hadoop/mapreduce/
步骤五：测试mapreduce
[hadoop@master mapreduce]$ hadoop jar hadoop-mapreduce-examples-2.7.1.jar wordcount /input/a.txt /output
成功如下：
步骤六：查看hdfs下的传输结果
[hadoop@master mapreduce]$ hadoop fs -lsr /output
步骤七：查看文件测试的结果
[hadoop@master mapreduce]$ hadoop fs -cat /output/part-r-00000
Hadoop 1
Hello 2
World 1
实验任务三：高可用性验证
步骤一：:自动切换服务状态
输入代码：
[hadoop@master mapreduce]$ cd
#hdfs haadmin -failover --forcefence --forceactive 主 备
[hadoop@master ~]$ hdfs haadmin -failover --forcefence --forceactive slave1 master
查看状态
[hadoop@master ~]$ hdfs haadmin -getServiceState slave1
[hadoop@master ~]$ hdfs haadmin -getServiceState master
步骤二：手动切换服务状态
在maste停止并启动namenode
[hadoop@master ~]$ hadoop-daemon.sh stop namenode
stopping namenode
查看状态
[hadoop@master ~]$ hdfs haadmin -getServiceState master
[hadoop@master ~]$ hdfs haadmin -getServiceState slave1
[hadoop@master ~]$ hadoop-daemon.sh start namenode
查看状态
[hadoop@master ~]$ hdfs haadmin -getServiceState slave1
[hadoop@master ~]$ hdfs haadmin -getServiceState master
查看web服务端
master:50070
slave1:50070