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From Andrea Barbato <and.barb...@gmail.com>
Subject Re: Hadoop C++ HDFS test running Exception
Date Wed, 15 Jan 2014 08:54:04 GMT
Thanks for the answer, but i can't find the client folder that contains the
files .jar: /usr/lib/hadoop/client/*.jar.
I'm using hadoop 2.2.0, can you tell me the name of this folder in that
version?



2014/1/14 Harsh J <harsh@cloudera.com>

> I've found in past that the native code runtime somehow doesn't
> support wildcarded classpaths. If you add the jars explicitly to the
> CLASSPATH, your app will work. You could use a simple shell loop such
> as at one of my random examples at
> https://github.com/QwertyManiac/cdh4-libhdfs-example/blob/master/exec.sh#L3
> to populate it easily instead of doing it by hand.
>
> On Mon, Jan 13, 2014 at 3:36 PM, Andrea Barbato <and.barbato@gmail.com>
> wrote:
> > I'm working with Hadoop 2.2.0 and trying to run this hdfs_test.cpp
> > application:
> >
> > #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);
> > }
> >
> > I compiled it but when I'm running it with ./hdfs_test I have this:
> >
> > loadFileSystems error:
> > (unable to get stack trace for java.lang.NoClassDefFoundError exception:
> > ExceptionUtils::getStackTrace error.)
> > hdfsBuilderConnect(forceNewInstance=0, nn=default, port=0,
> > kerbTicketCachePath=(NULL), userName=(NULL)) error:
> > (unable to get stack trace for java.lang.NoClassDefFoundError exception:
> > ExceptionUtils::getStackTrace error.)
> > hdfsOpenFile(/tmp/testfile.txt): constructNewObjectOfPath error:
> > (unable to get stack trace for java.lang.NoClassDefFoundError exception:
> > ExceptionUtils::getStackTrace error.)
> > Failed to open /tmp/testfile.txt for writing!
> >
> > Maybe is a problem with the classpath. My $HADOOP_HOME is
> /usr/local/hadoop
> > and actually this is my variable *CLASSPATH*:
> >
> > echo $CLASSPATH
> >
> /usr/local/hadoop/etc/hadoop:/usr/local/hadoop/share/hadoop/common/lib/*:/usr/local/hadoop/share/hadoop/common/*:/usr/local/hadoop/share/hadoop/hdfs:/usr/local/hadoop/share/hadoop/hdfs/lib/*:/usr/local/hadoop/share/hadoop/hdfs/*:/usr/local/hadoop/share/hadoop/yarn/lib/*:/usr/local/hadoop/share/hadoop/yarn/*:/usr/local/hadoop/share/hadoop/mapreduce/lib/*:/usr/local/hadoop/share/hadoop/mapreduce/*:/contrib/capacity-scheduler/*.jar
> >
> >
> > Any help is appreciated.. thanks
>
>
>
> --
> Harsh J
>

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