是否有人使用hadoop 2.6.0成功使用c ++中的hdfs?
我试图编译这段代码:
#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);
}
以下是我的文件夹列表:
$ ls ${HADOOP_HDFS_HOME}
bin etc include lib libexec LICENSE.txt logs NOTICE.txt README.txt sbin share
$ ls ${HADOOP_HDFS_HOME}/include
hdfs.h Pipes.hh SerialUtils.hh StringUtils.hh TemplateFactory.hh
$ ls ${HADOOP_HDFS_HOME}/lib/native
libhadoop.a libhadooppipes.a libhadoop.so libhadoop.so.1.0.0 libhadooputils.a libhdfs.a libhdfs.so libhdfs.so.0.0.0
我正在尝试使用此命令进行编译,并收到错误:
g++ -I${HADOOP_HDFS_HOME}/include -L${HADOOP_HDFS_HOME}/lib/native -lhdfs -lhadooputils -o hdfs_test hdfs_test.cpp
/tmp/ccyYER8m.o: In function `main':
hdfs_test.cpp:(.text+0x1b): undefined reference to `hdfsConnect'
hdfs_test.cpp:(.text+0x8f): undefined reference to `hdfsOpenFile'
hdfs_test.cpp:(.text+0xe8): undefined reference to `hdfsWrite'
hdfs_test.cpp:(.text+0xfe): undefined reference to `hdfsFlush'
hdfs_test.cpp:(.text+0x141): undefined reference to `hdfsCloseFile'
我知道我应该链接一些hadoop库,但我找不到任何文档。我也没有很多c ++经验。
答案 0 :(得分:1)
试试这个:
导出HADOOP_INSTALL = / home / james / Desktop / hadoop2.7.2 export PATH = $ PATH:$ HADOOP_INSTALL / bin
添加链接器设置: -lhadooppipes -lhadooputils
添加链接器搜索目录: / LIB /天然
<强>顺便说一句: 如果您在64位系统中工作,则需要为64位编译hadoop。