使用c++中的hadoop hdfs,未定义对“hdfsconnect”的引用

rn0zuynd  于 2021-06-02  发布在  Hadoop
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有人成功地使用了c++中的hdfs,使用了hadoop2.6.0吗?
我正试图编译这段代码:


# 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编译,但出现错误:

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,但是我找不到任何文档。而且我在c++方面没有太多的经验。

vd2z7a6w

vd2z7a6w1#

试试这个:
export hadoop\u install=/home/james/desktop/hadoop2.7.2 export path=$path:$hadoop\u install/bin
添加链接器设置:-lhadooppipes-lhadooputils
添加链接器搜索目录:/lib/native
顺便说一句:如果你在64位系统中工作,你需要为64位编译hadoop。

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