> > export HADOOP_OPTS="-Djava.net.preferIPv4Stack=true"
>
> Was there actually a problem if you didn't set this?
>
I have commented this out and restarted mapred and everything still worked ok.
It is probably only needed for the HDFS processes.
> > 4. Symink JNI library
> > cd $HADOOP_HOME/lib/native/Linux-amd64-64 (or Linux-i386-32 on 32-bit
> platform)
> > ln -s /usr/lib/jni/libcephfs_jni.so .
> >
> > I have tried adding -Djava.library.path=/usr/lib/jni to HADOOP_OPTS
> in hadoop-env.sh and exporting LD_LIBRARY_PATH=/usr/lib/jni in hadoop-
> env.sh, but it didn't work for me. I'd love to hear about a more
> elegant method of making Hadoop Ceph JNI aware w/o symlinking.
>
> I've never had to do the symlink trick. IIRC what works for me is to
> set LD_LIBRARY_PATH in hadoop-env.sh, and then restart the daemons. The
> Hadoop start-up scripts should update java.library.path automatically.
>
On my system it already fails at 'hadoop fs -ls /' which doesn't require any Hadoop daemons running.
hadoop script nulls JAVA_LIBRARY_PATH, finds the platform and populates JAVA_LIBRARY_PATH with ${HADOOP_HOME}/lib/native/${JAVA_PLATFORM} and then sets
-Djava.library.path=$JAVA_LIBRARY_PATH" to the options.
It would prepend this with ${HADOOP_HOME}/build/native/${JAVA_PLATFORM}/lib if it is present, so if you were building on the box, chances are it'll work.
I have also tried to add /usr/lib/jni to /etc/ld.so.conf.d/ceph.conf and ldconfig -v lists the libraries correctly, but it didn't help :(
So, with my mix of versions and Hadoop installed from the tarball onto user's home directory (other poster has mentioned that .deb Hadoop worked for him), there seem to be 3 ways to make this problem go away:
1. Symlink the library into directory already on the java.library.path
2. Add "JAVA_LIBRARY_PATH=${JAVA_LIBRARY_PATH}:/usr/lib/jni" to hadoop script directly
3. Make directory ${HADOOP_HOME}/build/native/${JAVA_PLATFORM} and symlink /usr/lib/jni to ${HADOOP_HOME}/build/native/${JAVA_PLATFORM}/lib
Cheers,
Ilja
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