hadoop-mapreduce-examples Hadoop实例

[root@master hadoop-3.1.1]# bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-3.1.1.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.
bbp: A map/reduce program that uses Bailey-Borwein-Plouffe to compute exact digits of Pi.
dbcount: An example job that count the pageview counts from a database.
distbbp: A map/reduce program that uses a BBP-type formula to compute exact bits of Pi.
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 a quasi-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.
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.
wordmean: A map/reduce program that counts the average length of the words in the input files.
wordmedian: A map/reduce program that counts the median length of the words in the input files.

有效的程序名称是：

aggregatewordcount：一个基于聚合的map/reduce程序，它对输入文件中的单词进行计数。

aggregatewordhist：一个基于聚合的map/reduce程序，用于计算输入文件中单词的直方图。

bbp:一个使用Bailey Borwein Plouffe计算PI精确数字的map/reduce程序。

dbcount：一个计算页面浏览量的示例作业，从数据库中计数。

distbbp：一个使用BBP型公式计算PI精确比特的map/reduce程序。

grep:一个在输入中计算正则表达式匹配的map/reduce程序。

join：一个影响连接排序、相等分区数据集的作业

multifilewc:一个从多个文件中计算单词的任务。

pentomino:一个地图/减少瓦片铺设程序来找到解决PotoMimo问题的方法。

pi:一个用拟蒙特卡洛方法估计PI的MAP/Relp程序。

randomtextwriter：一个map/reduce程序，每个节点写入10GB的随机文本数据。

randomwriter：一个映射/RADIUS程序，每个节点写入10GB的随机数据。

secondarysort：定义一个次要排序到减少的例子。

sort：一个对随机写入器写入的数据进行排序的map/reduce程序。

sudoku：数独求解者。

teragen:为terasort生成数据

terasort：运行terasort

teravalidate: terasort的检查结果

wordcount：一个映射/缩小程序，计算输入文件中的单词。

wordmean:map/reduce程序，用于计算输入文件中单词的平均长度。

wordmedian:map/reduce程序，用于计算输入文件中单词的中值长度。