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[[PageOutline]] = 實作二： HDFS 指令操作練習 = == 前言 == * 此部份接續實做一 == Content 1. 基本操作 == === 1.1 瀏覽你HDFS目錄 === === 1.2 上傳資料到HDFS目錄 === === 1.3 下載HDFS的資料到本地目錄 === === 1.4 更多指令操作 === == Content 2. Hadoop 運算命令 == === 2.1 Hadoop運算命令 grep === === 2.2 Hadoop運算命令 WordCount === === 2.3 更多運算命令 === 可執行的指令一覽表： || 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. || || 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. || || 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. || || wordcount || A map/reduce program that counts the words in the input files. || 請參考 [http://hadoop.apache.org/core/docs/current/api/org/apache/hadoop/examples/package-summary.html org.apache.hadoop.examples] {{{ #!html a.html

Class Summary
AggregateWordCount	This is an example Aggregated Hadoop Map/Reduce application. It reads the text input files, breaks each line into words and counts them. The output is a locally sorted list of words and the count of how often they occurred. To run: bin/hadoop jar hadoop-*-examples.jar aggregatewordcount in-dir out-dir numOfReducers textinputformat
AggregateWordHistogram	This is an example Aggregated Hadoop Map/Reduce application. Computes the histogram of the words in the input texts. To run: bin/hadoop jar hadoop-*-examples.jar aggregatewordhist in-dir out-dir numOfReducers textinputformat
ExampleDriver	A description of an example program based on its class and a human-readable description.
Grep
RandomTextWriter	This program uses map/reduce to just run a distributed job where there is no interaction between the tasks and each task writes a large unsorted random sequence of words.To run: bin/hadoop jar hadoop-${version}-examples.jar randomtextwriter [-outFormat output format class] output
RandomWriter	This program uses map/reduce to just run a distributed job where there is no interaction between the tasks and each task write a large unsorted random binary sequence file of BytesWritable.To run: bin/hadoop jar hadoop-${version}-examples.jar randomwriter [-outFormat output format class] output
Sort<K,V>	This is the trivial map/reduce program that does absolutely nothing other than use the framework to fragment and sort the input values.To run: bin/hadoop jar build/hadoop-examples.jar sort [-m maps] [-r reduces] [-inFormat input format class] [-outFormat output format class] [-outKey output key class] [-outValue output value class] [-totalOrder pcnt num samples max splits] in-dir out-dir
WordCount	This is an example Hadoop Map/Reduce application.

}}} == Content 3. 使用網頁Gui瀏覽訊息 == == 練習 ==