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分享c/c++上传大文件到hadoop平台的效率选择
学生党问一个问题。。。
c/c++程序中要把大文件存储到hadoop平台上
要怎么选择呢？
1.read file 、open file in hadoop 、while(write())
2.调用linux 的系统操作命令
c/c++程序中要把大文件存储到hadoop平台上
要怎么选择呢？
1.read file 、open file in hadoop 、while(write())
2.调用linux 的系统操作命令
...全文
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vah101 2014-05-16
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http://hadoop.apache.org/docs/r0.19.1/libhdfs.html
#include "hdfs.h"
int main(int argc, char **argv) {
hdfsFS fs = hdfsConnect("default", 0);
const char* writePath = "/tmp/testfile.txt";
hdfsFile writeFile = hdfsOpenFile(fs, writePath, O_WRONLY|O_CREAT, 0, 0, 0);
if(!writeFile) {
fprintf(stderr, "Failed to open %s for writing!\n", writePath);
exit(-1);
}
char* buffer = "Hello, World!";
tSize num_written_bytes = hdfsWrite(fs, writeFile, (void*)buffer, strlen(buffer)+1);
if (hdfsFlush(fs, writeFile)) {
fprintf(stderr, "Failed to 'flush' %s\n", writePath);
exit(-1);
}
hdfsCloseFile(fs, writeFile);
}
