hadoop启动的一些相关命令

启动namenode

sbin/hadoop-daemon.sh start namenode

sbin/hadoop-daemon.sh start datanode

关闭namenode

sbin/hadoop-daemon.sh stop datanode

sbin/hadoop-daemon.sh stop namenode

root@water:/home/hadoop# sbin/start-dfs.sh

Starting namenodes on [localhost]

localhost: starting namenode, logging to /home/hadoop-2.2.0/logs/hadoop-root-namenode-water.out

localhost: starting datanode, logging to /home/hadoop-2.2.0/logs/hadoop-root-datanode-water.out

Starting secondary namenodes [0.0.0.0]

0.0.0.0: starting secondarynamenode, logging to /home/hadoop-2.2.0/logs/hadoop-root-secondarynamenode-water.out

root@water:/home/hadoop# jps

SecondaryNameNode

NameNode

DataNode

Jps

root@water:/home/hadoop# sbin/start-yarn.sh

starting yarn daemons

starting resourcemanager, logging to /home/hadoop-2.2.0/logs/yarn-root-resourcemanager-water.out

localhost: starting nodemanager, logging to /home/hadoop-2.2.0/logs/yarn-root-nodemanager-water.out

root@water:/home/hadoop# jps

SecondaryNameNode

NameNode

DataNode

Jps

ResourceManager

NodeManager
http://127.0.0.1:8088/ 可以访问hadoop管理页面 hadoop job管理界面
http://127.0.0.1:50070 可以访问namenode节点信息。 可以查看各节点的文件 browser file system

2014-02-19 09:46:49,710 WARN [main-SendThread(localhost:2181)] zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 拒绝连接

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:735)

at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)

at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)

这个异常的解决可以 启动完hbase，不关闭，然后再启动一次hbase 就可以。。。。。奇怪 参考连接：启动namenode

sbin/hadoop-daemon.sh start namenode

sbin/hadoop-daemon.sh start datanode

关闭namenode

sbin/hadoop-daemon.sh stop datanode

sbin/hadoop-daemon.sh stop namenode

root@water:/home/hadoop# sbin/start-dfs.sh

Starting namenodes on [localhost]

localhost: starting namenode, logging to /home/hadoop-2.2.0/logs/hadoop-root-namenode-water.out

localhost: starting datanode, logging to /home/hadoop-2.2.0/logs/hadoop-root-datanode-water.out

Starting secondary namenodes [0.0.0.0]

0.0.0.0: starting secondarynamenode, logging to /home/hadoop-2.2.0/logs/hadoop-root-secondarynamenode-water.out

root@water:/home/hadoop# jps

SecondaryNameNode

NameNode

DataNode

Jps

root@water:/home/hadoop# sbin/start-yarn.sh

starting yarn daemons

starting resourcemanager, logging to /home/hadoop-2.2.0/logs/yarn-root-resourcemanager-water.out

localhost: starting nodemanager, logging to /home/hadoop-2.2.0/logs/yarn-root-nodemanager-water.out

root@water:/home/hadoop# jps

SecondaryNameNode

NameNode

DataNode

Jps

ResourceManager

NodeManager
http://127.0.0.1:8088/ 可以访问hadoop管理页面 hadoop job管理界面
http://127.0.0.1:50070 可以访问namenode节点信息。 可以查看各节点的文件 browser file system

2014-02-19 09:46:49,710 WARN [main-SendThread(localhost:2181)] zookeeper.ClientCnxn: Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect

java.net.ConnectException: 拒绝连接

at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)

at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:735)

at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:350)

at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1068)

这个异常的解决可以 启动完hbase，不关闭，然后再启动一次hbase 就可以。。。。。奇怪

八：停止Hadoop

若停止hadoop，依次运行如下命令：

$./stop-yarn.sh

$./stop-dfs.sh