我在哪里可以找到下面提到的示例程序的详细文档，我无法在文档中找到它。
hduser@canberra:~/work/software/cloudera/hadoop-2.0.0-cdh4.0.0$ hadoop jar src/hadoop-mapreduce-project/hadoop-mapreduce-examples/target/hadoop-mapreduce-examples-2.0.0-cdh4.0.0.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.
答案 0 :(得分：2)
AFAIK，所有示例都没有单独的文档。因此，代码是唯一的信息来源。
首先，必须从ExampleDriver.java找到有效程序名称（distbbp）和java类（o.a.h.examples.pi.DistBbp）之间的关联。大多数情况下的实际代码（o.a.h.examples.pi.DistBbp）都有要发送的参数及其在评论中的描述，如果没有通过代码的话。
答案 1 :(得分：0)
为了完整性，直接链接到（对我来说）更愉快的浏览界面代码：
从this related SO question找到此链接（并轻轻更新）。