libhdfs

Question

我有一个运行ning hdfs 实例，由 -

证明

reikdas@reikdas-HP-Pavilion-x360-Convertible-14-dh1xxx:~$ jps
16083 Jps
12389 NameNode
12774 SecondaryNameNode
11083

和

reikdas@reikdas-HP-Pavilion-x360-Convertible-14-dh1xxx:~$ hadoop fs -ls /
2021-09-27 12:06:59,520 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Found 1 items
drwxr-xr-x   - reikdas supergroup          0 2021-09-27 00:31 /test

我从 official documentation -

中复制了在 C 中使用 libhdfs 的规范示例

#include "hdfs.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

int main(int argc, char **argv) {

    hdfsFS fs = hdfsConnect("default", 0);
    // Also tested - hdfsConnect("127.0.0.1", 9000)
    const char* writePath = "/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);
}

然后我用 -

“成功”编译了它

gcc testlhdfs.c -I $HADOOP_HDFS_HOME/include/ -L $HADOOP_HDFS_HOME/lib/native -lhdfs

但是我在尝试运行可执行文件时遇到错误 -

./a.out: error while loading shared libraries: libhdfs.so.0.0.0: cannot open shared object file: No such file or directory

当我看到 $HADOOP_HDFS_HOME/lib/native -

中存在 libhdfs.so.0.0.0 时，我不知道为什么会出现此错误

reikdas@reikdas-HP-Pavilion-x360-Convertible-14-dh1xxx:~$ ls -l $HADOOP_HDFS_HOME/lib/native
total 166640
drwxr-xr-x 2 reikdas reikdas      4096 Jun 15 01:44 examples
-rw-r--r-- 1 reikdas reikdas   1507316 Jun 15 01:13 libhadoop.a
-rw-r--r-- 1 reikdas reikdas   1741256 Jun 15 01:44 libhadooppipes.a
lrwxrwxrwx 1 reikdas reikdas        18 Jun 15 01:13 libhadoop.so -> libhadoop.so.1.0.0
-rwxr-xr-x 1 reikdas reikdas    803040 Jun 15 01:13 libhadoop.so.1.0.0
-rw-r--r-- 1 reikdas reikdas    754382 Jun 15 01:44 libhadooputils.a
-rw-r--r-- 1 reikdas reikdas    551556 Jun 15 01:18 libhdfs.a
-rw-r--r-- 1 reikdas reikdas 106522330 Jun 15 01:20 libhdfspp.a
lrwxrwxrwx 1 reikdas reikdas        18 Jun 15 01:20 libhdfspp.so -> libhdfspp.so.0.1.0
-rwxr-xr-x 1 reikdas reikdas  44375064 Jun 15 01:20 libhdfspp.so.0.1.0
lrwxrwxrwx 1 reikdas reikdas        16 Jun 15 01:18 libhdfs.so -> libhdfs.so.0.0.0
-rwxr-xr-x 1 reikdas reikdas    333648 Jun 15 01:18 libhdfs.so.0.0.0
-rw-r--r-- 1 reikdas reikdas  10029114 Jun 15 01:39 libnativetask.a
lrwxrwxrwx 1 reikdas reikdas        22 Jun 15 01:39 libnativetask.so -> libnativetask.so.1.0.0
-rwxr-xr-x 1 reikdas reikdas   3985736 Jun 15 01:39 libnativetask.so.1.0.0

我的其他环境变量也已适当设置 -

export HADOOP_HOME=/home/reikdas/hadoop
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin
export HADOOP_OPTS="-Djava.library.path=$HADOOP_HOME/lib/native"

这可能是我在 core-site.xml 文件中设置的相关配置选项 -

<property>
    <name>fs.default.name</name>
    <value>hdfs://127.0.0.1:9000</value>
</property>

非常感谢在修复此错误时能得到的所有帮助。

Answer 1

你可以试试 ldconfig $HADOOP_HDFS_HOME/lib/native

libhdfs - 无法打开共享库 libhdfs.so.0.0.0.0

libhdfs - cannot open shared library libhdfs.so.0.0.0.0

c

hadoop

hdfs

shared-libraries