罗列出Hadoop中常用命令，用于日后查阅。
HDFS
- 格式化NameNode
bin/hdfs namenode -format
- 启停NameNode
sbin/hadoop-daemon.sh start/stop namenode
- 启停DataNode
sbin/hadoop-daemon.sh start/stop datanode
- 启停HDFS集群
sbin/start/stop-dfs.sh
YARN
- 启停ResourceManager
sbin/yarn-daemon.sh start/stop resourcemanager
- 启停NodeManager
sbin/yarn-daemon.sh start/stop nodemanager
- 启停WebAppProxy服务
sbin/yarn-daemon.sh start/stop proxyserver
- 启停MapReduce JobHistory Server
sbin/mr-jobhistory-daemon.sh start/stop historyserver
- 启停所有Yarn服务
sbin/start/stop-yarn.sh
状态查询
可是用jps命令查看各个服务是否启动，各个服务/进程的对应关系
| 进程 | 所属服务 | 备注 |
|---|---|---|
| NameNode | HDFS | sbin/hadoop-daemon.sh hdfs start namenode |
| DataNode | HDFS | sbin/hadoop-daemon.sh hdfs start datanode |
| SecondaryNameNode | HDFS | |
| ResourceManager | YARN | |
| NodeManager | YARN | |
| WebAppProxy | YARN | |
| JobHistoryServer | MapReduce | |
| QuorumPeerMain | Zookeeper | |
| DFSZKFailoverController | HDFS-HA | sbin/hadoop-daemon.sh start zkfc |
nn1> bin/hdfs zkfc -formatZK
jn1,jn2,jn3> sbin/hadoop-daemon.sh start journalnode
nn1> bin/hdfs namenode -format hcluster
nn1> sbin/hadoop-daemon.sh start namenode
nn2> bin/hdfs namenode -bootstrapStandby
nn2> sbin/hadoop-daemon.sh start namenode
nn1> sbin/hadoop-daemon.sh start zkfc
hdfs haadmin -transitionToActive nn1
hdfs haadmin -transitionToActive --forceactive nn1
hdfs haadmin -getServiceState nn1
bin/hdfs haadmin -failover --forceactive hadoop101 hadoop100
hdfs haadmin -transitionToActive --forceactive --forcemanual nn1