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#include "mapreduce.h"
int main(int argc, char *argv[]) {
if(argc < 4) {
printf("Less number of arguments.\n");
printf("./mapreduce #mappers #reducers inputFile\n");
exit(0);
}
// ###### DO NOT REMOVE ######
int nMappers = strtol(argv[1], NULL, 10);
int nReducers = strtol(argv[2], NULL, 10);
if (nMappers < nReducers) {
printf("Number of mappers must be greater than or equal to the number of reducers.\n");
exit(-1);
}
char *inputFile = argv[3];
// ###### DO NOT REMOVE ######
bookeepingCode();
// ###### DO NOT REMOVE ######
pid_t pid = fork();
if(pid == 0){
//send chunks of data to the mappers in RR fashion
sendChunkData(inputFile, nMappers);
exit(0);
} else if (pid == -1) {
printf("Fork failed!\n");
return 1;
}
sleep(1);
pid_t mapperPid;
for (int i = 1; i <= nMappers; i++) {
mapperPid = fork();
if (mapperPid == 0) {
char numMap[10];
sprintf(numMap, "%d", i);
execl("./mapper", "./mapper", numMap, NULL);
printf("Mapper execution failed! Make sure \"mapper\" exists in the directory.\n");
return 2;
} else if (mapperPid == -1) {
printf("Fork failed!\n");
return 1;
}
}
for (int i = 0; i <= nMappers; i++) {
int waitError = wait(NULL);
if (waitError == -1)
{
printf("Wait failed!\n");
return 5;
}
}
// ###### DO NOT REMOVE ######
// shuffle sends the word.txt files generated by mapper
// to reducer based on a hash function
pid = fork();
if(pid == 0){
shuffle(nMappers, nReducers);
exit(0);
} else if (pid == -1) {
printf("Fork failed!\n");
return 1;
}
sleep(1);
pid_t reducerPid;
for (int i = 1; i <= nReducers; i++) {
reducerPid = fork();
if (reducerPid == 0) {
char numRed[10];
sprintf(numRed, "%d", i);
execl("./reducer", "./reducer", numRed, NULL);
printf("Reducer execution failed! Make sure \"reducer\" exists in the directory.\n");
return 2;
} else if (reducerPid == -1) {
printf("Fork failed!\n");
return 1;
}
}
for (int i = 0; i <= nReducers; i++) {
int waitError = wait(NULL);
if (waitError == -1) {
printf("Wait failed!\n");
return 5;
}
}
return 0;
}
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