libhdfs的配置和使用

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測試環境：centos6.10，hadoop2.7.3，jdk1.8

測試代碼：HDFSCSample.c

#include "hdfs.h"#include <string.h>#include <stdio.h>#include <stdlib.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);}

編譯指令碼：

　　compile.sh

#!/bin/bashexport JAVA_HOME=/root/softs/jdk1.8.0_172export HADOOP_HOME=/root/softs/hadoop-2.7.3/gcc -I$HADOOP_HOME/include -L$HADOOP_HOME/lib/native -lhdfs -L$JAVA_HOME/jre/lib/amd64/server -ljvm HDFSCSample.c

執行命令：　

　　# chmod +x compile.sh

　　# ./compile.sh

執行指令碼：

　　execute.sh

#!/bin/bashexport JAVA_HOME=/root/softs/jdk1.8.0_172export HADOOP_HOME=/root/softs/hadoop-2.7.3/export LD_LIBRARY_PATH=$HADOOP_HOME/lib/native:$JAVA_HOME/jre/lib/amd64/server/CLASSPATH=./for f in $HADOOP_HOME/share/hadoop/common/*.jar; do  CLASSPATH=${CLASSPATH}:$f;donefor f in $HADOOP_HOME/share/hadoop/common/lib/*.jar; do  CLASSPATH=${CLASSPATH}:$f;donefor f in $HADOOP_HOME/share/hadoop/hdfs/*.jar; do  CLASSPATH=${CLASSPATH}:$f;donefor f in $HADOOP_HOME/share/hadoop/hdfs/lib/*.jar; do  CLASSPATH=${CLASSPATH}:$f;doneexport CLASSPATH=$CLASSPATH./a.out

執行命令：

　　# chmod +x execute.sh

　　# ./execute.sh

開啟/tmp/testFile.txt,可以看到裡面寫入了一條 Hello, World!

　　

libhdfs的配置和使用