Hadoop配置文件

${HADOOP_HOME}/conf目录下的配置文件：

core-site.xml
hadoop.tmp.dir: A base for other temporary directories(用来存储其他临时目录的根目录)
fs.default.name: The name of the default file system.  A URI whose scheme and authority determine the FileSystem implementation.  The uri's scheme determines the config property (fs.SCHEME.impl) naming the FileSystem implementation class.  The uri's authority is used to determine the host, port, etc. for a filesystem.


hdfs-site.xml
dfs.name.dir: Determines where on the local filesystem the DFS name node should store the name table(fsimage).  If this is a comma-delimited list of directories then the name table is replicated in all of the directories, for redundancy.

dfs.data.dir: Determines where on the local filesystem an DFS data node should store its blocks.  If this is a comma-delimited list of directories, then data will be stored in all named directories, typically on different devices. Directories that do not exist are ignored.

mapred-site.xml
mapred.job.tracker: The host and port that the MapReduce job tracker runs at.  If "local", then jobs are run in-process as a single map and reduce task.

mapred.system.dir: The shared directory where MapReduce stores control files.

mapred.local.dir: The local directory where MapReduce stores intermediate data files.  May be a comma-separated list of directories on different devices in order to spread disk i/o. Directories that do not exist are ignored.

slaves
List all slave hostnames or IP addresses in your conf/slaves file, one per line.

Start Hadoop
./${HADOOP_HOME}/bin/start-all.sh

Stop Hadoop
./${HADOOP_HOME}/bin/stop-all.sh