#include “hdfs.h” int main(int argc, char **argv) { if (argc != 4) { fprintf(stderr, “Usage: hdfs_read \n”); exit(-1); } hdfsFS fs = hdfsConnect(“default”, 0); if (!fs) { fprintf(stderr, “Oops! Failed to connect to hdfs!\n”); exit(-1); } const char* rfile = argv[1]; tSize fileTotalSize = strtoul(argv[2], NULL, 10); tSize bufferSize = strtoul(argv[3], NULL, 10); hdfsFile readFile = hdfsOpenFile(fs, rfile, O_RDONLY, bufferSize, 0, 0); if (!readFile) { fprintf(stderr, “Failed to open %s for writing!\n”, rfile); exit(-2); } // data to be written to the file char* buffer = malloc(sizeof(char) * bufferSize); if(buffer == NULL) { return -2; } // read from the file tSize curSize = bufferSize; for (; curSize == bufferSize;) { curSize = hdfsRead(fs, readFile, (void*)buffer, curSize); } free(buffer); hdfsCloseFile(fs, readFile); hdfsDisconnect(fs); return 0; }
#include “hdfs.h” int main(int argc, char **argv) { if (argc != 4) { fprintf(stderr, “Usage: hdfs_write \n”); exit(-1); } hdfsFS fs = hdfsConnect(“default”, 0); if (!fs) { fprintf(stderr, “Oops! Failed to connect to hdfs!\n”); exit(-1); } const char* writeFileName = argv[1]; tSize fileTotalSize = strtoul(argv[2], NULL, 10); tSize bufferSize = strtoul(argv[3], NULL, 10); hdfsFile writeFile = hdfsOpenFile(fs, writeFileName, O_WRONLY, bufferSize, 0, 0); if (!writeFile) { fprintf(stderr, “Failed to open %s for writing!\n”, writeFileName); exit(-2); } // data to be written to the file char* buffer = malloc(sizeof(char) * bufferSize); if(buffer == NULL) { return -2; } int i = 0; for (i=0; i < bufferSize; ++i) { buffer[i] = 'a' + (i%26); } // write to the file tSize nrRemaining; for (nrRemaining = fileTotalSize; nrRemaining > 0; nrRemaining -= bufferSize ) { int curSize = ( bufferSize < nrRemaining ) ? bufferSize : (int)nrRemaining; hdfsWrite(fs, writeFile, (void*)buffer, curSize); } free(buffer); hdfsCloseFile(fs, writeFile); hdfsDisconnect(fs); return 0; }