Wow, you are so right! it's on the local filesystem! Do I have to manually specify hdfs-site.xml and core-site.xml in the CLASSPATH variable ? Like this: CLASSPATH=$CLASSPATH:/usr/local/hadoop/etc/hadoop/core-site.xml ?
On Thu, Mar 5, 2015 at 10:04 AM, Azuryy Yu <azury...@gmail.com> wrote: > you need to include core-site.xml as well. and I think you can find > '/tmp/testfile.txt' on your local disk, instead of HDFS. > > if so, My guess is right. because you don't include core-site.xml, then > your Filesystem schema is file:// by default, not hdfs://. > > > > On Thu, Mar 5, 2015 at 3:52 PM, Alexandru Calin < > alexandrucali...@gmail.com> wrote: > >> I am trying to run the basic libhdfs example, it compiles ok, and >> actually runs ok, and executes the whole program, but I cannot see the file >> on the HDFS. >> >> It is said here <http://hadoop.apache.org/docs/r1.2.1/libhdfs.html>, >> that you have to include *the right configuration directory containing >> hdfs-site.xml* >> >> My hdfs-site.xml: >> >> <configuration> >> <property> >> <name>dfs.replication</name> >> <value>1</value> >> </property> >> <property> >> <name>dfs.namenode.name.dir</name> >> <value>file:///usr/local/hadoop/hadoop_data/hdfs/namenode</value> >> </property> >> <property> >> <name>dfs.datanode.data.dir</name> >> <value>file:///usr/local/hadoop/hadoop_store/hdfs/datanode</value> >> </property></configuration> >> >> I generate my classpath with this: >> >> #!/bin/bashexport CLASSPATH=/usr/local/hadoop/ >> declare -a subdirs=("hdfs" "tools" "common" "yarn" "mapreduce")for subdir in >> "${subdirs[@]}"do >> for file in $(find /usr/local/hadoop/share/hadoop/$subdir -name >> *.jar) >> do >> export CLASSPATH=$CLASSPATH:$file >> donedone >> >> and I also add export CLASSPATH=$CLASSPATH:/usr/local/hadoop/etc/hadoop , >> where my *hdfs-site.xml* reside. >> >> MY LD_LIBRARY_PATH = >> /usr/local/hadoop/lib/native:/usr/lib/jvm/java-7-openjdk-amd64/jre/lib/amd64/server >> Code: >> >> #include "hdfs.h"#include <stdio.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) { >> printf("Failed to open %s for writing!\n", writePath); >> exit(-1); >> } >> printf("\nfile opened\n"); >> char* buffer = "Hello, World!"; >> tSize num_written_bytes = hdfsWrite(fs, writeFile, (void*)buffer, >> strlen(buffer)+1); >> printf("\nWrote %d bytes\n", (int)num_written_bytes); >> if (hdfsFlush(fs, writeFile)) { >> printf("Failed to 'flush' %s\n", writePath); >> exit(-1); >> } >> hdfsCloseFile(fs, writeFile); >> hdfsDisconnect(fs); >> return 0;} >> >> It compiles and runs without error, but I cannot see the file on HDFS. >> >> I have Hadoop 2.6.0 on Ubuntu 14.04 64bit. >> >> Any ideas on this ? >> >> >> >
