| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "hdfs/hdfs.h" |
| |
| #include <limits.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <sys/types.h> |
| |
| int main(int argc, char **argv) { |
| hdfsFS fs; |
| const char *writeFileName = argv[1]; |
| off_t fileTotalSize = strtoul(argv[2], NULL, 10); |
| long long tmpBufferSize = strtoul(argv[3], NULL, 10); |
| tSize bufferSize; |
| hdfsFile writeFile; |
| char* buffer; |
| int i; |
| off_t nrRemaining; |
| tSize curSize; |
| tSize written; |
| |
| if (argc != 4) { |
| fprintf(stderr, "Usage: hdfs_write <filename> <filesize> <buffersize>\n"); |
| exit(-1); |
| } |
| |
| fs = hdfsConnect("default", 0); |
| if (!fs) { |
| fprintf(stderr, "Oops! Failed to connect to hdfs!\n"); |
| exit(-1); |
| } |
| |
| // sanity check |
| if(fileTotalSize == ULONG_MAX && errno == ERANGE) { |
| fprintf(stderr, "invalid file size %s - must be <= %lu\n", argv[2], ULONG_MAX); |
| exit(-3); |
| } |
| |
| // currently libhdfs writes are of tSize which is int32 |
| if(tmpBufferSize > INT_MAX) { |
| fprintf(stderr, "invalid buffer size libhdfs API write chunks must be <= %d\n",INT_MAX); |
| exit(-3); |
| } |
| |
| bufferSize = (tSize)tmpBufferSize; |
| |
| 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 |
| buffer = malloc(sizeof(char) * bufferSize); |
| if(buffer == NULL) { |
| fprintf(stderr, "Could not allocate buffer of size %d\n", bufferSize); |
| return -2; |
| } |
| for (i=0; i < bufferSize; ++i) { |
| buffer[i] = 'a' + (i%26); |
| } |
| |
| // write to the file |
| for (nrRemaining = fileTotalSize; nrRemaining > 0; nrRemaining -= bufferSize ) { |
| curSize = ( bufferSize < nrRemaining ) ? bufferSize : (tSize)nrRemaining; |
| if ((written = hdfsWrite(fs, writeFile, (void*)buffer, curSize)) != curSize) { |
| fprintf(stderr, "ERROR: hdfsWrite returned an error on write: %d\n", written); |
| exit(-3); |
| } |
| } |
| |
| free(buffer); |
| hdfsCloseFile(fs, writeFile); |
| hdfsDisconnect(fs); |
| |
| return 0; |
| } |
| |
| /** |
| * vim: ts=4: sw=4: et: |
| */ |
| |