Hadoop Sample question

Description:
Find the max elem globally from all arrays,
array1 = [2,3...655], length = 300
array2 = [4,6,6,466], length = 300
... array9 ...

1. Source file
FileName: FindMaxValue.java
Author: Billy Zhang ([email protected])
Date: May 27, 2014

2. Input file: data.txt
12 36 90 21 45 410 78 69 231 345 901 821 82 77 38 129 561

3. Compile , run(Hadoop 1.2.3 Version)
run test.sh
Here is the commands in test.sh:

#!/bin/bash
 rm -rf Output*
 rm -rf FindMaxValue.jar

javac -classpath  ${HADOOP_PREFIX}/hadoop-core-${HADOOP_VERSION}.jar:${HADOOP_PREFIX}/lib/commons-cli-1.2.jar -d fd_Classes ./*.java
jar -cvf ./FindMaxValue.jar -C fd_Classes/ .
hadoop fs -rmr Input
hadoop fs -mkdir Input
hadoop fs -copyFromLocal data.txt Input
hadoop fs -rmr Output*
hadoop jar FindMaxValue.jar FindMaxValue Input  Output
hadoop fs -getmerge Output/* Output
cat Output

4 Result
Max elem is : 901