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                不做強制要求,能完成最好。但是要求要明白 NameNode 和 ResourceManager是存在單點故障問題的,解決方式就是 HA(High Available、即高可用性集群)。 [TOC] # 1. HDFS-HA集群配置 ## 1.1 配置HDFS-HA集群 1. 官方地址:http://hadoop.apache.org/ 2. HDFS高可用集群規劃,請先搭建好一個Hadoop完全分布式集群(可以未進行namenode格式化)和ZooKeeper完全分布式環境已經安裝完成。 | Hadoop102 | Hadoop103 | Hadoop104 | | --- | --- | --- | | NameNode | NameNode | | | ResourceManager | ResourceManager | | | ZKFC(zookeeper的一個集群監控工具) | ZKFC | | | DataNode | DataNode | DataNode | | JournalNode | JournalNode | JournalNode | | NodeManager | NodeManager | NodeManager | | ZooKeeper | ZooKeeper | ZooKeeper | 3. 在hadoop102配置core-site.xml ```xml <configuration> <!-- 把兩個NameNode)的地址組裝成一個集群mycluster --> <property> <name>fs.defaultFS</name> <value>hdfs://mycluster</value> </property> <!-- 指定hadoop運行時產生文件的存儲目錄 --> <property> <name>hadoop.tmp.dir</name> <value>/opt/install/hadoop/data/tmp</value> </property> </configuration> ``` 4. 在hadoop102配置hdfs-site.xml ```xml <configuration> <!-- 完全分布式集群名稱 --> <property> <name>dfs.nameservices</name> <value>mycluster</value> </property> <!-- 集群中NameNode節點都有哪些,這里是nn1和nn2 --> <property> <name>dfs.ha.namenodes.mycluster</name> <value>nn1,nn2</value> </property> <!-- nn1的RPC通信地址 --> <property> <name>dfs.namenode.rpc-address.mycluster.nn1</name> <value>hadoop102:9000</value> </property> <!-- nn2的RPC通信地址 --> <property> <name>dfs.namenode.rpc-address.mycluster.nn2</name> <value>hadoop103:9000</value> </property> <!-- nn1的http通信地址 --> <property> <name>dfs.namenode.http-address.mycluster.nn1</name> <value>hadoop102:50070</value> </property> <!-- nn2的http通信地址 --> <property> <name>dfs.namenode.http-address.mycluster.nn2</name> <value>hadoop103:50070</value> </property> <!-- 指定NameNode元數據在JournalNode上的存放位置 --> <property> <name>dfs.namenode.shared.edits.dir</name> <value>qjournal://hadoop102:8485;hadoop103:8485;hadoop104:8485/mycluster</value> </property> <!-- 配置隔離機制,即同一時刻只能有一臺服務器對外響應,多個機制用換行分割,即每個機制占用一行 --> <property> <name>dfs.ha.fencing.methods</name> <value> sshfence shell(/bin/true) </value> </property> <!-- 使用隔離機制時需要ssh無秘鑰登錄--> <property> <name>dfs.ha.fencing.ssh.private-key-files</name> <value>/home/hadoop/.ssh/id_rsa</value> </property> <!-- 聲明journalnode服務器存儲目錄--> <property> <name>dfs.journalnode.edits.dir</name> <value>/opt/install/hadoop/data/jn</value> </property> <!-- 關閉權限檢查--> <property> <name>dfs.permissions.enable</name> <value>false</value> </property> <!-- 訪問代理類:client,mycluster,active配置失敗自動切換實現方式--> <property> <name>dfs.client.failover.proxy.provider.mycluster</name> <value>org.apache.hadoop.hdfs.server.namenode.ha.ConfiguredFailoverProxyProvider</value> </property> </configuration> ``` 5. 拷貝配置好的hadoop環境到其他節點。 ```xml scp core-site.xml root@hadoop103:$PWD scp hdfs-site.xml root@hadoop103:$PWD ``` <br/> ## 1.2 啟動HDFS-HA集群 1. 在各個JournalNode節點上,輸入以下命令啟動journalnode服務: ```sql $HADOOP_HOME/sbin/hadoop-daemon.sh start journalnode ``` 2. 在[nn1]上,對其進行格式化,并啟動(如果之前已經格式化過,此處格式化會導致namenode和datanode VRESION中的clusterID不一致,進而導致datanode無法啟動。解決方案:修改datanode中的clusterID與namenode中的clusterID相同): ```sql $HADOOP_HOME/bin/hdfs namenode -format $HADOOP_HOME/sbin/hadoop-daemon.sh start namenode ``` 3. 在[nn2]上,同步nn1的元數據信息: ```sql $HADOOP_HOME/bin/hdfs namenode -bootstrapStandby ``` 4. 啟動[nn2]: ```sql $HADOOP_HOME/sbin/hadoop-daemon.sh start namenode ``` 5. 查看web頁面顯示 ![](https://img.kancloud.cn/6f/b9/6fb9da0a5e6308333137c05515199250_487x161.png) ![](https://img.kancloud.cn/b5/af/b5af1a68b34012a2f994ba7e4ac55de4_493x167.png) 6. 在[nn1]上,啟動所有datanode ```sql $HADOOP_HOME/sbin/hadoop-daemons.sh start datanode ``` 7. 將[nn1]切換為Active ```sql $HADOOP_HOME/bin/hdfs haadmin -transitionToActive nn1 ``` 8. 查看是否Active ```sql $HADOOP_HOME/bin/hdfs haadmin -getServiceState nn1 ``` <br/> ## 1.3 配置HDFS-HA自動故障轉移 1. 具體配置 (1)在hdfs-site.xml中增加 ```xml <property> <name>dfs.ha.automatic-failover.enabled</name> <value>true</value> </property> (2)在core-site.xml文件中增加 <property> <name>ha.zookeeper.quorum</name> <value>hadoop102:2181,hadoop103:2181,hadoop104:2181</value> </property> ``` 2. 啟動 (1)關閉所有HDFS服務: ```sql stop-dfs.sh ``` (2)啟動Zookeeper集群: ```sql zkServer.sh start ``` (3)初始化HA在Zookeeper中狀態: ```sql hdfs zkfc -formatZK ``` (4)啟動HDFS服務: ```sql start-dfs.sh ``` (5)在各個NameNode節點上啟動DFSZK Failover Controller,先在哪臺機器啟動,哪個機器的NameNode就是Active NameNode(默認start-dfs.sh已經自動啟動,以下是單獨啟動的命令) ```sql hadoop-daemon.sh start zkfc ``` 3.驗證 (1)將Active NameNode進程kill ```sql kill -9 namenode的進程id ``` (2)將Active NameNode機器斷開網絡 ```sql service network stop ``` <br/> # 2. YARN-HA配置 ## 2.1 配置YARN-HA集群 1. 規劃集群 | hadoop102 | hadoop103 | | --- | --- | | ResourceManager | ResourceManager | 2. 具體配置 (1)yarn-site.xml ```xml <configuration> <property> <name>yarn.nodemanager.aux-services</name> <value>mapreduce_shuffle</value> </property> <!--啟用resourcemanager ha--> <property> <name>yarn.resourcemanager.ha.enabled</name> <value>true</value> </property> <!--聲明兩臺resourcemanager的地址--> <property> <name>yarn.resourcemanager.cluster-id</name> <value>cluster-yarn1</value> </property> <property> <name>yarn.resourcemanager.ha.rm-ids</name> <value>rm1,rm2</value> </property> <property> <name>yarn.resourcemanager.hostname.rm1</name> <value>hadoop102</value> </property> <property> <name>yarn.resourcemanager.hostname.rm2</name> <value>hadoop103</value> </property> <!--指定zookeeper集群的地址--> <property> <name>yarn.resourcemanager.zk-address</name> <value>hadoop102:2181,hadoop103:2181,hadoop104:2181</value> </property> <!--啟用自動恢復--> <property> <name>yarn.resourcemanager.recovery.enabled</name> <value>true</value> </property> <!--指定resourcemanager的狀態信息存儲在zookeeper集群--> <property> <name>yarn.resourcemanager.store.class</name> <value>org.apache.hadoop.yarn.server.resourcemanager.recovery.ZKRMStateStore</value> </property> </configuration> ``` (2)同步更新其他節點的yarn-site.xml配置信息 3. 啟動yarn (1)在hadoop102中執行: `start-yarn.sh` (2)在hadoop103中執行: `yarn-daemon.sh start resourcemanager` (3)查看服務狀態 `yarn rmadmin -getServiceState rm1`
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