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MapReduce.cpp
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MapReduce.cpp
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#include "MapReduce.h"
#include <fstream>
#include <sstream>
#include<string>
#include <iostream>
#include <sys/types.h>
#include <unistd.h>
#define PATH "/tmp/" //PART OF CONFIG
static int fileAppend()
{
static int count = 0;
return ++count;
}
void getNextWord(std::ifstream& inFile, std::string& token, std::string tokenizer, int64_t endOffSet)
{
token.clear();
char byte[1];
while(inFile.good())
{
if(inFile.tellg() >= endOffSet)
return;
byte[0] =inFile.peek();
if(byte[0]=='\n' || byte[0] == tokenizer.c_str()[0]){
inFile.get();
}else{
break;
}
}
while(inFile.good()){
byte[0] = inFile.get();
if(byte[0]=='\n' || byte[0] == tokenizer.c_str()[0]){
return;
}
token.append(byte,1);
}
}
std::string wordcountmap(std::string inputFile, int64_t startOffset, int64_t endOffset)
{
std::ifstream inFile;
inFile.open(inputFile.c_str(), std::fstream::in);
inFile.seekg (startOffset, inFile.beg); //read all till < endOffset
std::string token;
std::stringstream ss;
uint64_t count =0;
while(inFile.tellg() < endOffset){
getNextWord(inFile,token," ",endOffset); //tokenizer
if(token.size() == 0) continue;
count++;
}
inFile.close();
ss.clear();
ss<<PATH<<getpid()<<fileAppend();
std::string pidstr(ss.str());
std::ofstream outFile;
outFile.open(pidstr.c_str(), std::fstream::out);
outFile<<"count "<<count<<std::endl;
outFile.close();
return ss.str();
}
std::string wordcountreduce(std::string inputFile, std::string inputFile2)
{
std::ifstream inFile,inFile2;
inFile.open(inputFile.c_str(), std::fstream::in);
inFile2.open(inputFile2.c_str(), std::fstream::in);
uint64_t i,count;
std::string str;
inFile>> str>> i;
count =i;
inFile2>>str >>i;
count = count +i;
std::stringstream ss;
ss.clear();
ss<<PATH<<getpid()<<"reduce"<<fileAppend();
std::string pidstr(ss.str());
std::ofstream outFile;
outFile.open(pidstr.c_str(), std::fstream::out);
outFile<<"count "<<count<<std::endl;
outFile.close();
return ss.str();
}
std::string wordcountMapmap(std::string inputFile, int64_t startOffset, int64_t endOffset)
{
std::ifstream inFile;
inFile.open(inputFile.c_str(), std::fstream::in);
inFile.seekg (startOffset, inFile.beg); //read all till < endOffset
std::string token;
std::stringstream ss;
std::map<std::string, int> wcMap;
while(inFile.tellg() < endOffset){
getNextWord(inFile,token," ",endOffset); //tokenizer
if(!token.compare(" ")) continue;
if(token.size()==0) continue;
if(wcMap.count(token)){
wcMap[token]++;
}else{
wcMap[token]=1;
}
}
inFile.close();
ss.clear();
ss<<PATH<<getpid()<<fileAppend();
std::string pidstr(ss.str());
std::ofstream outFile;
outFile.open(pidstr.c_str(), std::fstream::out);
std::map<std::string, int>::iterator it;
for(it = wcMap.begin();it!= wcMap.end(); it++){
outFile<<it->first<<" "<<it->second<<std::endl;
}
outFile.close();
return ss.str();
}
std::string wordcountMapreduce(std::string inputFile, std::string inputFile2)
{
std::ifstream inFile,inFile2;
inFile.open(inputFile.c_str(), std::fstream::in);
inFile2.open(inputFile2.c_str(), std::fstream::in);
uint64_t i;
std::string str;
std::map<std::string, int> wcMap;
while(inFile>> str>> i){
wcMap[str] = i;
}
while(inFile2>> str>> i){
if(wcMap.count(str)){
wcMap[str] = wcMap[str] + i;
}else{
wcMap[str] = i;
}
}
std::stringstream ss;
ss.clear();
ss<<PATH<<getpid()<<"reduce"<<fileAppend();
std::string pidstr(ss.str());
std::ofstream outFile;
outFile.open(pidstr.c_str(), std::fstream::out);
std::map<std::string, int>::iterator it;
for(it = wcMap.begin();it!= wcMap.end(); it++){
outFile<<it->first<<" "<<it->second<<std::endl;
}
outFile.close();
return ss.str();
}
std::map<std::string, mapfunc> createMap_map()
{
std::map<std::string, mapfunc> m;
m["wordcount"] = wordcountmap;
m["wordcountmap"] = wordcountMapmap;
return m;
}
std::map<std::string, reducefunc> createReduce_map()
{
std::map<std::string, reducefunc> m;
m["wordcount"] = wordcountreduce;
m["wordcountmap"] = wordcountMapreduce;
return m;
}
std::map<std::string,mapfunc> mapReduce:: mapFunctions = createMap_map();
std::map<std::string,reducefunc> mapReduce:: reduceFunctions = createReduce_map();