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集群设置
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/ClusterSetup.html
用户手册
http://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-hdfs/HdfsUserGuide.html
Daemon
Environment Variable
NameNode
HDFS_NAMENODE_OPTS
DataNode
HDFS_DATANODE_OPTS
Secondary NameNode
HDFS_SECONDARYNAMENODE_OPTS
ResourceManager
YARN_RESOURCEMANAGER_OPTS
NodeManager
YARN_NODEMANAGER_OPTS
WebAppProxy
YARN_PROXYSERVER_OPTS
Map Reduce Job History Server
MAPRED_HISTORYSERVER_OPTS
To start a Hadoop cluster you will need to start both the HDFS and YARN cluster.
The first time you bring up HDFS, it must be formatted. Format a new distributed filesystem as hdfs:
[hdfs]$ $HADOOP_HOME/bin/hdfs namenode -format
Start the HDFS NameNode with the following command on the designated node as hdfs:
[hdfs]$ $HADOOP_HOME/bin/hdfs --daemon start namenode
Start a HDFS DataNode with the following command on each designated node as hdfs:
[hdfs]$ $HADOOP_HOME/bin/hdfs --daemon start datanode
If etc/hadoop/workers and ssh trusted access is configured (see Single Node Setup), all of the HDFS processes can be started with a utility script. As hdfs:
[hdfs]$ $HADOOP_HOME/sbin/start-dfs.sh
Start the YARN with the following command, run on the designated ResourceManager as yarn:
[yarn]$ $HADOOP_HOME/bin/yarn --daemon start resourcemanager
Run a script to start a NodeManager on each designated host as yarn:
[yarn]$ $HADOOP_HOME/bin/yarn --daemon start nodemanager
Start a standalone WebAppProxy server. Run on the WebAppProxy server as yarn. If multiple servers are used with load balancing it should be run on each of them:
[yarn]$ $HADOOP_HOME/bin/yarn --daemon start proxyserver
If etc/hadoop/workers and ssh trusted access is configured (see Single Node Setup), all of the YARN processes can be started with a utility script. As yarn:
[yarn]$ $HADOOP_HOME/sbin/start-yarn.sh
Start the MapReduce JobHistory Server with the following command, run on the designated server as mapred:
[mapred]$ $HADOOP_HOME/bin/mapred --daemon start historyserver
Hadoop Shutdown
Stop the NameNode with the following command, run on the designated NameNode as hdfs:
[hdfs]$ $HADOOP_HOME/bin/hdfs --daemon stop namenode
Run a script to stop a DataNode as hdfs:
[hdfs]$ $HADOOP_HOME/bin/hdfs --daemon stop datanode
If etc/hadoop/workers and ssh trusted access is configured (see Single Node Setup), all of the HDFS processes may be stopped with a utility script. As hdfs:
[hdfs]$ $HADOOP_HOME/sbin/stop-dfs.sh
Stop the ResourceManager with the following command, run on the designated ResourceManager as yarn:
[yarn]$ $HADOOP_HOME/bin/yarn --daemon stop resourcemanager
Run a script to stop a NodeManager on a worker as yarn:
[yarn]$ $HADOOP_HOME/bin/yarn --daemon stop nodemanager
If etc/hadoop/workers and ssh trusted access is configured (see Single Node Setup), all of the YARN processes can be stopped with a utility script. As yarn:
[yarn]$ $HADOOP_HOME/sbin/stop-yarn.sh
Stop the WebAppProxy server. Run on the WebAppProxy server as yarn. If multiple servers are used with load balancing it should be run on each of them:
[yarn]$ $HADOOP_HOME/bin/yarn stop proxyserver
Stop the MapReduce JobHistory Server with the following command, run on the designated server as mapred:
[mapred]$ $HADOOP_HOME/bin/mapred --daemon stop historyserver
Web Interfaces
Once the Hadoop cluster is up and running check the web-ui of the components as described below:
Daemon
Web Interface
Notes
NameNode
http://nn_host:port/
Default HTTP port is 9870.
ResourceManager
http://rm_host:port/
Default HTTP port is 8088.
MapReduce JobHistory Server
http://jhs_host:port/
Default HTTP port is 19888.
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