1. load file into hdfs
hadoop fs -put src dest
example: load a fold "input" into hdfs "input1" folder, "input1" folder must not already exist
you can not load a single file when folder is not exist
hadoop fs -put /mnt/hgfs/input input1
when folder is already exist, you can put single file into folder
hadoop fs -put /mnt/hgfs/input/a.txt input1
2. list file in hdfs
hadoop fs -ls
hadoop fs -ls input
3. open file in hdfs
example: open all file in output folder
hadoop fs -cat output/*
4. run a jar file in hadoop(class name must include package name)
hadoop jar hello.jar package_name.Class_name args...
example:
hadoop jar ha-0.0.1-SNAPSHOT.jar ha.WordCount input/wcInput.txt output3
