2014-02-14 69 views

回答

3

您可以通過運行看例子程序列表:

hadoop jar /path/to/hadoop-mapreduce-examples-2.2.0.jar 

我的輸出:

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. 
+0

真棒!謝謝傑里米! – user3311268

+1

@Jeremy Beard:在哪裏可以獲得這些程序的完整信息(如代碼,運行前所需的參數_wordcount_ _path/to/input_ _path/to/output_) –

+0

只有在添加到conf/hadoop-env.sh :export HADOOP_CLASSPATH = $ HADOOP_CLASSPATH:$ HADOOP_MAPRED_HOME:$ HADOOP_HDFS_HOME:$ HADOOP_YARN_HOME:$ HADOOP_HOME:$ HADOOP_CONF_DIR:$ YARN_CONF_DIR:$ JSVC_HOME – alex

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