You can always print out the hadoop classpath before running the hadoop
command, for example by editing the $HADOOP_HOME/bin/hadoop file.

HTH.

On Wed, Mar 6, 2013 at 5:01 AM, shubhangi <[EMAIL PROTECTED]> wrote:

> Hi All,
>
>
>  I am writing an application in c++, which uses API provided by libhdfs to
>> manipulate Hadoop DFS.
>> I could run the application with 1.0.4 and 1.1.1; setting classpath equal
>> to
>> $(hadoop classpath).
>>
>> For Hadoop 2.0.3; setting CLASSPATH=$(hadoop classpath) does not load
>> necessary classes required forlibhdfs; as opposed to 1.x versions; giving
>> the following error:
>>
>> 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.)
>>
>> I tried loading the jar files with their full path specified (as opposed
>> to wildcard characters used in the classpath); and the application runs,
>> but gives the following warning:
>>
>> SLF4J: Failed to load class "org.slf4j.impl.**StaticLoggerBinder".
>> SLF4J: Defaulting to no-operation (NOP) logger implementation
>> SLF4J: See http://www.slf4j.org/codes.**html#StaticLoggerBinder<http://www.slf4j.org/codes.html#StaticLoggerBinder>for further details.
>> 13/03/04 11:17:23 WARN util.NativeCodeLoader: Unable to load
>> native-hadoop library for your platform... using builtin-java classes where
>> applicable
>>
>>  The environment is:
>
> Environment: Ubuntu 12.04 32 bit, java version "1.7.0_03"
> Hadoop release: 2.0.3-alpha
>
> Any help would be appreciated.
>
> Thank you in advance,
> Shubhangi
>

When you constructed the classpath with the full path did you also add slf4j-log4j12-*.jar(http://www.slf4j.org/codes.html#StaticLoggerBinder) to the classpath. The jar should be in HADOOP_HOME/lib. This should help with SLF4J issue.

> 13/03/04 11:17:23 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable

How did you install hadoop. Did you use tarballs or rpm's? Do you have so files in HADOOP_HOME/lib/native?

If you used tarballs you might have to rebuild the native code for your OS

https://svn.apache.org/repos/asf/hadoop/common/tags/release-2.0.3-alpha/BUILDING.txt

--
Arpit Gupta
Hortonworks Inc.
http://hortonworks.com/

On Mar 6, 2013, at 1:50 AM, shubhangi <[EMAIL PROTECTED]> wrote:

> I am writing an application in c++, which uses API provided by libhdfs to manipulate Hadoop DFS.
> I could run the application with 1.0.4 and 1.1.1; setting classpath equal to
> $(hadoop classpath).
>
> For Hadoop 2.0.3; setting CLASSPATH=$(hadoop classpath) does not load necessary classes required forlibhdfs; as opposed to 1.x versions; giving the following error:
>
> 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.)
>
> I tried loading the jar files with their full path specified (as opposed to wildcard characters used in the classpath); and the application runs, but gives the following warning:
>
> SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
> SLF4J: Defaulting to no-operation (NOP) logger implementation
> SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
> 13/03/04 11:17:23 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
>