Trying to use Fuse to mount HDFS. Can't compile libhdfs

Question

I'm attempting to compile libhdfs (a native shared library that allows external apps to interface with hdfs). It's one of the few steps I have to take to mount Hadoop's hdfs using Fuse.

The compilation seems to go well for a while but finishes with "BUILD FAILED" and the following problems summary -

commons-logging#commons-logging;1.0.4: configuration not found in commons-logging#commons-logging;1.0.4: 'master'. It was required from org.apache.hadoop#Hadoop;working@btsotbal800 commons-logging

log4j#log4j;1.2.15: configuration not found in log4j#log4j;1.2.15: 'master'. It was required from org.apache.hadoop#Hadoop;working@btsotbal800 log4j

Now, I have a couple questions about this, in that the book which I'm using to do this doesn't go into any details about what these things really are.

1. Are commons-logging and log4j libraries which Hadoop uses?
2. These libraries seem to live in $HADOOP_HOME/lib. They are jar files though. Should I extract them, try to change some configurations, and then repack them back into a jar?
3. What does 'master' in the errors above mean? Are there different versions of the libraries?

Thank you in advance for ANY insight you can provide.

Answer 1

If you are using cloudera hadoop(cdh3u2), you dont need to build the fuse project.

you can find the binary(libhdfs.so*) inside the directory $HADOOP_HOME/c++/lib

Before fuse mount update the "$HADOOP_HOME/contrib/fuse-dfs/src/fuse_dfs_wrapper.sh" as follows

HADOOP_HOME/contrib/fuse-dfs/src/fuse_dfs_wrapper.sh

#!/bin/bash

for f in ${HADOOP_HOME}/hadoop*.jar ; do
   export CLASSPATH=$CLASSPATH:$f
done

for f in ${HADOOP_HOME}/lib/*.jar ; do
   export CLASSPATH=$CLASSPATH:$f
done

export PATH=$HADOOP_HOME/contrib/fuse-dfs:$PATH
export LD_LIBRARY_PATH=$HADOOP_HOME/c++/lib:/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/amd64/server/
fuse_dfs $@

LD_LIBRARY_PATH contains the list of directories here
"$HADOOP_HOME/c++/lib" contains libhdfs.so and
"/usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/amd64/server/" contains libjvm.so \# modify /usr/lib/jvm/java-6-sun-1.6.0.26/jre/lib/amd64/server/ as your java_home

Use the following command for mounting hdfs

fuse_dfs_wrapper.sh dfs://localhost:9000/ /home/510600/mount1

for unmounting use the following command

fusermount  -u /home/510600/mount1 

I tested fuse only in hadoop pseudo mode not in cluster mode