root@u1:/home/sa/hod/hadoop-0.20.1# bin/hadoop fs -put ./conf/core-site.xml /input
root@u1:/home/sa/hod/hadoop-0.20.1# bin/hadoop jar hadoop-*-examples.jar wordcount /input /output2
root@u1:/home/sa/hod/hadoop-0.20.1# bin/hadoop jar hadoop-*-examples.jar
An example program must be given as the first argument.
Valid program names are:
aggregatewordcount: An Aggregate based map/reduce program that counts the words in the input files.
aggregatewordhist: An Aggregate based map/reduce program that computes the histogram of the words in the input files.
dbcount: An example job that count the pageview counts from a database.
grep: A map/reduce program that counts the matches of a regex in the input.
join: A job that effects a join over sorted, equally partitioned datasets
multifilewc: A job that counts words from several files.
pentomino: A map/reduce tile laying program to find solutions to pentomino problems.
pi: A map/reduce program that estimates Pi using monte-carlo method.
randomtextwriter: A map/reduce program that writes 10GB of random textual data per node.
randomwriter: A map/reduce program that writes 10GB of random data per node.
secondarysort: An example defining a secondary sort to the reduce.
sleep: A job that sleeps at each map and reduce task.
sort: A map/reduce program that sorts the data written by the random writer.
sudoku: A sudoku solver.
teragen: Generate data for the terasort
terasort: Run the terasort
teravalidate: Checking results of terasort
wordcount: A map/reduce program that counts the words in the input files.
localadmin@node1:~/hadoop-0.20.2$ hadoop jar hadoop-0.20.2-examples.jar wordcount
Usage: wordcount <in> <out>