-
Format the filesystem:
$ bin/hdfs namenode -format
-
Start NameNode daemon and DataNode daemon:
$ sbin/start-dfs.sh
The hadoop daemon log output is written to the $HADOOP_LOG_DIR directory (defaults to $HADOOP_HOME/logs).
-
Browse the web interface for the NameNode; by default it is available at:
- NameNode - http://localhost:50070/
-
Make the HDFS directories required to execute MapReduce jobs:
$ bin/hdfs dfs -mkdir /user $ bin/hdfs dfs -mkdir /user/<username>
-
Copy the input files into the distributed filesystem:
$ bin/hdfs dfs -put etc/hadoop input
-
Run some of the examples provided:
$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.7.3.jar grep input output 'dfs[a-z.]+'
-
Examine the output files: Copy the output files from the distributed filesystem to the local filesystem and examine them:
$ bin/hdfs dfs -get output output $ cat output/*
or
View the output files on the distributed filesystem:
$ bin/hdfs dfs -cat output/*
-
When you’re done, stop the daemons with:
$ sbin/stop-dfs.sh
Hadoop hdfs命令
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