Hi Brian, Thanks for your reply. I downloaded hadoop-0.20.2 from apache.org site only. In my package the libhdfs is not present in the path you mentioned. It is present in hadoop-0.20.2/c++/Linux-i386-32/lib/libhdfs.so. Further, I created a directory libhdfs inside build directory manually and created symlinks to libhdfs.so and libhdfs.so.0 from the above directory. This is what i did:
mkdir $HADOOP_HOME/build/libhdfs cd $HADOOP_HOME/build/libhdfs ln -s $HADOOP_HOME/c++/Linux-i386-32/lib/libhdfs.so libhdfs.so ln -s $HADOOP_HOME/c++/Linux-i386-32/lib/libhdfs.so.0 libhdfs.so.0 Could you tell me if something's wrong with this? I also tried manually creating the directory you mentioned and put the libhdfs files there. That doesn't work. Could you suggest to me what I should do now? If I need to change the package I am using, please tell me the link to the version which works. Thanks again for your time. Regards, Aastha. On 18 March 2011 18:53, Brian Bockelman <bbock...@cse.unl.edu> wrote: > Hi Aastha, > > This is not hadoop-specific advice, but general debugging: > > 1) Verify you are using the version of the library you think you are. > Done. > 2) Rebuild. > 3) Check the timestamp on the rebuilt source and verify it's from > approximately now. > > In trunk, the directory you point to is *not* where libhdfs is built. It > is here: > > build/c++/lib/libhdfs.so > > Don't know where you got your sources from; that might be an issue. > > Brian > > On Mar 18, 2011, at 4:58 AM, Aastha Mehta wrote: > > > Hi Brian, > > > > Thanks for your reply. I checked the libhdfs.so to which it links. > Following > > is the output of the ldd command: > > > > $ ldd ./fuse_dfs > > > > linux-gate.so.1 => (0x009c3000) > > libhdfs.so.0 => > /home/hadoop/hadoop/hadoop-0.20.2/build/libhdfs/libhdfs.so.0 > > (0x00457000) > > libfuse.so.2 => /usr/local/lib/libfuse.so.2 (0x00567000) > > libjvm.so => > /usr/lib/jvm/java-6-sun-1.6.0.24/jre/lib/i386/client/libjvm.so > > (0x00ef3000) > > libc.so.6 => /lib/tls/i686/cmov/libc.so.6 (0x00110000) > > libm.so.6 => /lib/tls/i686/cmov/libm.so.6 (0x00c78000) > > libdl.so.2 => /lib/tls/i686/cmov/libdl.so.2 (0x006ab000) > > libpthread.so.0 => /lib/tls/i686/cmov/libpthread.so.0 (0x008d3000) > > librt.so.1 => /lib/tls/i686/cmov/librt.so.1 (0x00ce8000) > > /lib/ld-linux.so.2 (0x00ed6000) > > > > Although the fuse_dfs_wrapper.sh script has specified the LD_LIBRARY_PATH > > there, I had to do an explicit export of the variable so that > libhdfs.so.0 > > and libjvm.so files above had links to the correct object files. > > > > Could you please tell what could the problem be now? > > > > Thanks, > > > > Aastha. > > > > On 18 March 2011 03:08, Brian Bockelman <bbock...@cse.unl.edu> wrote: > > > >> Hi Aastha, > >> > >> Try using "ldd" against the fuse_dfs executable, and see where you are > >> pulling libhdfs.so from. It may be it is linking from the "wrong one". > >> > >> Brian > >> > >> On Mar 17, 2011, at 3:24 PM, Aastha Mehta wrote: > >> > >>> Hello, > >>> > >>> I am working on a project involving hdfs and fuse-dfs API on top of it. > I > >>> wanted to trace through the functions called from libhdfs API by > fuse-dfs > >>> functions. I added print statements inside the hdfs.c file in > appropriate > >>> places to see how the functions progress. I execute ant > >> compile-c++-libhdfs > >>> -Dlibhdfs=1 and then ant compile-contrib -Dlibhdfs=1 -Dfusedfs=1 > >>> -Djava5.home=/usr/lib/jvm/java-1.5.0-sun. However, when I use fuse-dfs > I > >>> cannot see any of the print statements executed from libhdfs/hdfs.c. > >>> > >>> I am using hadoop-0.20.2 version and the libhdfs is present in > >>> hadoop-0.20.2/src/c++/libhdfs. Could someone tell me if this libhdfs is > >> the > >>> one compiled and used or if there will be some other libhdfs that is > >>> accessed. If this is the one, then why are the changes made in its > files > >>> reflected on running the code? > >>> > >>> Thanks, > >>> Aastha. > >>> > >>> -- > >>> Aastha Mehta > >>> Intern, NetApp, Bangalore > >>> 4th year undergraduate, BITS Pilani > >>> E-mail: aasth...@gmail.com > >> > >> > > > > > > -- > > Aastha Mehta > > Intern, NetApp, Bangalore > > 4th year undergraduate, BITS Pilani > > E-mail: aasth...@gmail.com > > -- Aastha Mehta Intern, NetApp, Bangalore 4th year undergraduate, BITS Pilani E-mail: aasth...@gmail.com
