Hi Tamas, Have you tried using the supplied hdfs_write executable includes in the distribution? Also, I didn't understand your comment about using hdfsJniHelper.c - that should be used only by hdfs.c itself.
Also, what version of hadoop is this? I haven't seen this problem at least in hadoop 0.17. And have you run this under gdb? -- pete On 11/6/08 10:30 AM, "Tamás Szokol" <[EMAIL PROTECTED]> wrote: Hello! I'd like to ask your help in a libhdfs related problem. I'm trying to perform HDFS tests from C by using the libhdfs API. I created a test program, that measures the creation times of 1MB, 10MB, 100MB and 1GB large files. The test runs well for 1 MB and 10 MB but as soon as I reach to 100MB I receive a SIGSEGV error: ================================================================== # # An unexpected error has been detected by Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x00007fbead12a32c, pid=6918, tid=140456938362592 # # Java VM: Java HotSpot(TM) 64-Bit Server VM (10.0-b22 mixed mode linux-amd64) # Problematic frame: # V [libjvm.so+0x36d32c] # # If you would like to submit a bug report, please visit: # http://java.sun.com/webapps/bugreport/crash.jsp # --------------- T H R E A D --------------- Current thread (0x0000000000609800): JavaThread "main" [_thread_in_vm, id=6918, stack(0x00007fffb5cc2000,0x00007fffb5ec2000)] siginfo:si_signo=SIGSEGV: si_errno=0, si_code=1 (SEGV_MAPERR), si_addr=0x0000000000000000 Registers: RAX=0x0000000000000090, RBX=0x0000000000609800, RCX=0x00007fbead60d1e0, RDX=0x00007fbead447780 RSP=0x00007fffb5ec1240, RBP=0x00007fffb5ec12c0, RSI=0x0000000000000000, RDI=0x0000000000609800 R8 =0x00007fbe7dcff010, R9 =0x0000000000000400, R10=0x00007fbead610c50, R11=0x00007fbea35180c0 R12=0x0000000006300000, R13=0x0000000000000000, R14=0x0000000000000000, R15=0x00007fffb5ec1250 RIP=0x00007fbead12a32c, EFL=0x0000000000010246, CSGSFS=0x0000000000000033, ERR=0x0000000000000004 TRAPNO=0x000000000000000e Top of Stack: (sp=0x00007fffb5ec1240) 0x00007fffb5ec1240: 0000000000609998 00007fbe7dcff010 0x00007fffb5ec1250: 0000000000609800 000000000060a1f0 0x00007fffb5ec1260: 0000000000000090 00007fbead447780 0x00007fffb5ec1270: 0000000000609800 0000000000602720 0x00007fffb5ec1280: 0000000000609800 0000000000609998 0x00007fffb5ec1290: 0000000000609800 00007fbe84014220 0x00007fffb5ec12a0: 0000000000609998 00007fbe7dcff010 0x00007fffb5ec12b0: 00000000006f7848 0000000000000000 0x00007fffb5ec12c0: 0000000006300000 00007fbeada9ccff 0x00007fffb5ec12d0: 00000000006f7830 0000000000000000 0x00007fffb5ec12e0: 000000000060a660 0000000000000000 0x00007fffb5ec12f0: 0000000000000000 0000000000000021 0x00007fffb5ec1300: 00007fffb5ec1370 0000000000000000 0x00007fffb5ec1310: 00007fffb5ec14b0 0000000000000000 0x00007fffb5ec1320: 0000000000000000 0000000000400e37 0x00007fffb5ec1330: 0000000000000000 00007fbe7dcff010 0x00007fffb5ec1340: 0630000000000001 0000000000602720 0x00007fffb5ec1350: 063000000000000b 00007fbe84014220 0x00007fffb5ec1360: 00000000006f7840 0000000000000021 0x00007fffb5ec1370: 00007fffb5ec1390 0000000000400cdd 0x00007fffb5ec1380: 00007fbe7dcff010 0000001800401126 0x00007fffb5ec1390: 00007fffb5ec13d0 0000000000400b1b 0x00007fffb5ec13a0: 000000000000003c 00007fffb5ec14b8 0x00007fffb5ec13b0: 0000000100401040 0000000000602280 0x00007fffb5ec13c0: 0000000000000022 00007fbeadec0c00 0x00007fffb5ec13d0: 0000000000000000 00007fbead7561c4 0x00007fffb5ec13e0: 00000000004009c0 00007fffb5ec14b8 0x00007fffb5ec13f0: 0000000100000000 0000000000400a78 0x00007fffb5ec1400: 00007fbeadec0c00 0c1103e05d01fe14 0x00007fffb5ec1410: 0000000000000000 00007fffb5ec14b0 0x00007fffb5ec1420: 0000000000000000 0000000000000000 0x00007fffb5ec1430: f3ee68387ac1fe14 f36c590a9ffffe14 Instructions: (pc=0x00007fbead12a32c) 0x00007fbead12a31c: 5d 90 48 83 7b 08 00 0f 85 5d 01 00 00 45 85 ed 0x00007fbead12a32c: 49 8b 36 78 13 45 85 e4 78 0e 47 8d 1c 2c 44 3b Stack: [0x00007fffb5cc2000,0x00007fffb5ec2000], sp=0x00007fffb5ec1240, free space=2044k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [libjvm.so+0x36d32c] --------------- P R O C E S S --------------- Java Threads: ( => current thread ) 0x000000000069f800 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=6925, stack(0x00007fbe8b1b5000,0x00007fbe9b1b6000)] 0x000000000069dc00 JavaThread "CompilerThread1" daemon [_thread_blocked, id=6924, stack(0x0000000041c3e000,0x0000000041d3f000)] 0x0000000000692400 JavaThread "CompilerThread0" daemon [_thread_blocked, id=6923, stack(0x0000000041b3d000,0x0000000041c3e000)] 0x0000000000690c00 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=6922, stack(0x0000000061e4c000,0x0000000071e4d000)] 0x000000000066cc00 JavaThread "Finalizer" daemon [_thread_blocked, id=6921, stack(0x0000000051e4b000,0x0000000061e4c000)] 0x000000000066b800 JavaThread "Reference Handler" daemon [_thread_blocked, id=6920, stack(0x0000000041e4a000,0x0000000051e4b000)] =>0x0000000000609800 JavaThread "main" [_thread_in_vm, id=6918, stack(0x00007fffb5cc2000,0x00007fffb5ec2000)] Other Threads: 0x0000000000666400 VMThread [stack: 0x0000000041a3c000,0x0000000041b3d000] [id=6919] 0x00000000006a1800 WatcherThread [stack: 0x0000000041d3f000,0x0000000041e40000] [id=6926] VM state:not at safepoint (normal execution) VM Mutex/Monitor currently owned by a thread: None Heap def new generation total 39296K, used 0K [0x00007fbe9b470000, 0x00007fbe9df10000, 0x00007fbe9df10000) eden space 34944K, 0% used [0x00007fbe9b470000, 0x00007fbe9b470000, 0x00007fbe9d690000) from space 4352K, 0% used [0x00007fbe9d690000, 0x00007fbe9d690000, 0x00007fbe9dad0000) to space 4352K, 0% used [0x00007fbe9dad0000, 0x00007fbe9dad0000, 0x00007fbe9df10000) tenured generation total 87424K, used 405K [0x00007fbe9df10000, 0x00007fbea3470000, 0x00007fbea3470000) the space 87424K, 0% used [0x00007fbe9df10000, 0x00007fbe9df75778, 0x00007fbe9df75800, 0x00007fbea3470000) compacting perm gen total 21248K, used 6148K [0x00007fbea3470000, 0x00007fbea4930000, 0x00007fbea8870000) the space 21248K, 28% used [0x00007fbea3470000, 0x00007fbea3a71280, 0x00007fbea3a71400, 0x00007fbea4930000) No shared spaces configured. Dynamic libraries: 00400000-00402000 r-xp 00000000 08:01 107801 /home/sony/dev/hadoop-0.19/libhdfs/hdfs_write_test2 00601000-00602000 rw-p 00001000 08:01 107801 /home/sony/dev/hadoop-0.19/libhdfs/hdfs_write_test2 00602000-01b8f000 rw-p 00602000 00:00 0 [heap] 41a3c000-41a3d000 ---p 41a3c000 00:00 0 41a3d000-41b3d000 rwxp 41a3d000 00:00 0 41b3d000-41b40000 ---p 41b3d000 00:00 0 41b40000-41c3e000 rwxp 41b40000 00:00 0 41c3e000-41c41000 ---p 41c3e000 00:00 0 41c41000-41d3f000 rwxp 41c41000 00:00 0 41d3f000-41d40000 ---p 41d3f000 00:00 0 41d40000-41e40000 rwxp 41d40000 00:00 0 41e4a000-41e4d000 ---p 41e4a000 00:00 0 41e4d000-51e4b000 rwxp 41e4d000 00:00 0 51e4b000-51e4e000 ---p 51e4b000 00:00 0 51e4e000-61e4c000 rwxp 51e4e000 00:00 0 61e4c000-61e4f000 ---p 61e4c000 00:00 0 61e4f000-71e4d000 rwxp 61e4f000 00:00 0 7fbe50dfc000-7fbe50dff000 rwxp 7fbe50dfc000 00:00 0 7fbe50dff000-7fbe60dfd000 rwxp 7fbe50dff000 00:00 0 7fbe7dcff000-7fbe840cd000 rw-p 7fbe7dcff000 00:00 0 7fbe840cd000-7fbe88000000 ---p 7fbe840cd000 00:00 0 7fbe8b08d000-7fbe8b093000 r-xp 00000000 08:01 466691 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libmanagement.so 7fbe8b093000-7fbe8b192000 ---p 00006000 08:01 466691 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libmanagement.so 7fbe8b192000-7fbe8b194000 rw-p 00005000 08:01 466691 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libmanagement.so 7fbe8b194000-7fbe8b1b5000 r--s 0022f000 08:01 101826 /home/sony/dev/hadoop-0.19/build/hadoop-0.20.0-dev-core.jar 7fbe8b1b5000-7fbe8b1b8000 ---p 7fbe8b1b5000 00:00 0 7fbe8b1b8000-7fbe9b1b6000 rwxp 7fbe8b1b8000 00:00 0 7fbe9b1b6000-7fbe9b1f5000 r--p 00000000 08:01 466319 /usr/lib/locale/hu_HU.utf8/LC_CTYPE 7fbe9b1f5000-7fbe9b227000 rw-p 7fbe9b1f5000 00:00 0 7fbe9b227000-7fbe9b3b2000 r--s 02df0000 08:01 434280 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/rt.jar 7fbe9b3b2000-7fbe9b3da000 rw-p 7fbe9b3b2000 00:00 0 7fbe9b3da000-7fbe9b3e5000 rwxp 7fbe9b3da000 00:00 0 7fbe9b3e5000-7fbe9b405000 rwxp 7fbe9b3e5000 00:00 0 7fbe9b405000-7fbe9b450000 rwxp 7fbe9b405000 00:00 0 7fbe9b450000-7fbe9b46f000 rwxp 7fbe9b450000 00:00 0 7fbe9b46f000-7fbea4930000 rwxp 7fbe9b46f000 00:00 0 7fbea4930000-7fbea8870000 rwxp 7fbea4930000 00:00 0 7fbea8874000-7fbea8876000 r--s 0000d000 08:01 181160 /home/sony/dev/commons-logging-1.1.1/commons-logging-1.1.1.jar 7fbea8876000-7fbea887d000 r--s 00000000 08:01 447736 /usr/lib/gconv/gconv-modules.cache 7fbea887d000-7fbea8aed000 rwxp 7fbea887d000 00:00 0 7fbea8aed000-7fbeab87d000 rwxp 7fbea8aed000 00:00 0 7fbeab87d000-7fbeab88b000 r-xp 00000000 08:01 466659 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libzip.so 7fbeab88b000-7fbeab98d000 ---p 0000e000 08:01 466659 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libzip.so 7fbeab98d000-7fbeab990000 rw-p 00010000 08:01 466659 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libzip.so 7fbeab990000-7fbeab991000 rw-p 7fbeab990000 00:00 0 7fbeab991000-7fbeab9b9000 r-xp 00000000 08:01 466672 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libjava.so 7fbeab9b9000-7fbeabab9000 ---p 00028000 08:01 466672 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libjava.so 7fbeabab9000-7fbeabac0000 rw-p 00028000 08:01 466672 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libjava.so 7fbeabac0000-7fbeabacd000 r-xp 00000000 08:01 466654 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libverify.so 7fbeabacd000-7fbeabbcc000 ---p 0000d000 08:01 466654 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libverify.so 7fbeabbcc000-7fbeabbcf000 rw-p 0000c000 08:01 466654 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/libverify.so 7fbeabbcf000-7fbeabbd9000 r-xp 00000000 08:01 574895 /lib/libnss_files-2.7.so 7fbeabbd9000-7fbeabdd9000 ---p 0000a000 08:01 574895 /lib/libnss_files-2.7.so 7fbeabdd9000-7fbeabddb000 rw-p 0000a000 08:01 574895 /lib/libnss_files-2.7.so 7fbeabddb000-7fbeabde5000 r-xp 00000000 08:01 574897 /lib/libnss_nis-2.7.so 7fbeabde5000-7fbeabfe4000 ---p 0000a000 08:01 574897 /lib/libnss_nis-2.7.so 7fbeabfe4000-7fbeabfe6000 rw-p 00009000 08:01 574897 /lib/libnss_nis-2.7.so 7fbeabfe6000-7fbeabfee000 r-xp 00000000 08:01 574893 /lib/libnss_compat-2.7.so 7fbeabfee000-7fbeac1ed000 ---p 00008000 08:01 574893 /lib/libnss_compat-2.7.so 7fbeac1ed000-7fbeac1ef000 rw-p 00007000 08:01 574893 /lib/libnss_compat-2.7.so 7fbeac1ef000-7fbeac205000 r-xp 00000000 08:01 574892 /lib/libnsl-2.7.so 7fbeac205000-7fbeac404000 ---p 00016000 08:01 574892 /lib/libnsl-2.7.so 7fbeac404000-7fbeac406000 rw-p 00015000 08:01 574892 /lib/libnsl-2.7.so 7fbeac406000-7fbeac408000 rw-p 7fbeac406000 00:00 0 7fbeac408000-7fbeac40f000 r-xp 00000000 08:01 466661 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/native_threads/libhpi.so 7fbeac40f000-7fbeac510000 ---p 00007000 08:01 466661 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/native_threads/libhpi.so 7fbeac510000-7fbeac512000 rw-p 00008000 08:01 466661 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/native_threads/libhpi.so 7fbeac512000-7fbeac513000 rw-p 7fbeac512000 00:00 0 7fbeac513000-7fbeac51b000 r-xp 00000000 08:01 574902 /lib/librt-2.7.so 7fbeac51b000-7fbeac71a000 ---p 00008000 08:01 574902 /lib/librt-2.7.so 7fbeac71a000-7fbeac71c000 rw-p 00007000 08:01 574902 /lib/librt-2.7.so 7fbeac71c000-7fbeac732000 r-xp 00000000 08:01 574900 /lib/libpthread-2.7.so 7fbeac732000-7fbeac932000 ---p 00016000 08:01 574900 /lib/libpthread-2.7.so 7fbeac932000-7fbeac934000 rw-p 00016000 08:01 574900 /lib/libpthread-2.7.so 7fbeac934000-7fbeac938000 rw-p 7fbeac934000 00:00 0 7fbeac938000-7fbeac93a000 r-xp 00000000 08:01 574889 /lib/libdl-2.7.so 7fbeac93a000-7fbeacb3a000 ---p 00002000 08:01 574889 /lib/libdl-2.7.so 7fbeacb3a000-7fbeacb3c000 rw-p 00002000 08:01 574889 /lib/libdl-2.7.so 7fbeacb3c000-7fbeacbbc000 r-xp 00000000 08:01 574890 /lib/libm-2.7.so 7fbeacbbc000-7fbeacdbb000 ---p 00080000 08:01 574890 /lib/libm-2.7.so 7fbeacdbb000-7fbeacdbd000 rw-p 0007f000 08:01 574890 /lib/libm-2.7.so 7fbeacdbd000-7fbead4b2000 r-xp 00000000 08:01 466678 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/server/libjvm.so 7fbead4b2000-7fbead5b1000 ---p 006f5000 08:01 466678 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/server/libjvm.so 7fbead5b1000-7fbead6fb000 rw-p 006f4000 08:01 466678 /usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/server/libjvm.so 7fbead6fb000-7fbead738000 rw-p 7fbead6fb000 00:00 0 7fbead738000-7fbead890000 r-xp 00000000 08:01 574886 /lib/libc-2.7.so 7fbead890000-7fbeada90000 ---p 00158000 08:01 574886 /lib/libc-2.7.so 7fbeada90000-7fbeada93000 r--p 00158000 08:01 574886 /lib/libc-2.7.so 7fbeada93000-7fbeada95000 rw-p 0015b000 08:01 574886 /lib/libc-2.7.so 7fbeada95000-7fbeada9a000 rw-p 7fbeada95000 00:00 0 7fbeada9a000-7fbeadaa3000 r-xp 00000000 08:01 106434 /home/sony/dev/hadoop-0.19/libhdfs/libhdfs.so. 7fbeadaa3000-7fbeadca2000 ---p 00009000 08:01 106434 /home/sony/dev/hadoop-0.19/libhdfs/libhdfs.so. 7fbeadca2000-7fbeadca3000 rw-p 00008000 08:01 106434 /home/sony/dev/hadoop-0.19/libhdfs/libhdfs.so. 7fbeadca3000-7fbeadcc0000 r-xp 00000000 08:01 574883 /lib/ld-2.7.so 7fbeadcc1000-7fbeadcf6000 rwxp 7fbeadcc1000 00:00 0 7fbeadcf6000-7fbeaddac000 rwxp 7fbeadcf6000 00:00 0 7fbeaddac000-7fbeadeb1000 rw-p 7fbeaddac000 00:00 0 7fbeadeb1000-7fbeadeb2000 r--p 7fbeadeb1000 00:00 0 7fbeadeb2000-7fbeadeba000 rw-s 00000000 08:01 163163 /tmp/hsperfdata_sony/6918 7fbeadeba000-7fbeadebb000 rwxp 7fbeadeba000 00:00 0 7fbeadebb000-7fbeadebc000 r--p 7fbeadebb000 00:00 0 7fbeadebc000-7fbeadec0000 rw-p 7fbeadebc000 00:00 0 7fbeadec0000-7fbeadec2000 rw-p 0001d000 08:01 574883 /lib/ld-2.7.so 7fffb5cc2000-7fffb5cc5000 ---p 7fffb5cc2000 00:00 0 7fffb5cc5000-7fffb5ec2000 rwxp 7fffffe02000 00:00 0 [stack] 7fffb5ffe000-7fffb6000000 r-xp 7fffb5ffe000 00:00 0 [vdso] ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0 [vsyscall] VM Arguments: jvm_args: -Xss256M -Xoss256M -XX:ThreadStackSize=262144 -Xms128M -Xmx128M java_command: <unknown> Launcher Type: generic Environment Variables: JAVA_HOME=/usr/lib/jvm/java-6-sun CLASSPATH=/usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/rt.jar:/home/sony/dev/hadoop-0.19/build/hadoop-0.20.0-dev-core.jar:/home/sony/dev/commons-logging-1.1.1/commons-logging-1.1.1.jar PATH=/home/sony/dev/hadoop-0.19/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games LD_LIBRARY_PATH=/usr/lib/jvm/java-6-sun-1.6.0.06/jre/lib/amd64/server:/home/sony/dev/hadoop-0.19/libhdfs SHELL=/bin/bash Signal Handlers: SIGSEGV: [libjvm.so+0x6616e0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGBUS: [libjvm.so+0x6616e0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGFPE: [libjvm.so+0x5044d0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGPIPE: [libjvm.so+0x5044d0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGXFSZ: [libjvm.so+0x5044d0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGILL: [libjvm.so+0x5044d0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGUSR1: SIG_DFL, sa_mask[0]=0x00000000, sa_flags=0x00000000 SIGUSR2: [libjvm.so+0x506740], sa_mask[0]=0x00000000, sa_flags=0x10000004 SIGHUP: [libjvm.so+0x5064a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGINT: [libjvm.so+0x5064a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGTERM: [libjvm.so+0x5064a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 SIGQUIT: [libjvm.so+0x5064a0], sa_mask[0]=0x7ffbfeff, sa_flags=0x10000004 --------------- S Y S T E M --------------- OS:lenny/sid uname:Linux 2.6.24-19-generic #1 SMP Wed Aug 20 17:53:40 UTC 2008 x86_64 libc:glibc 2.7 NPTL 2.7 rlimit: STACK 1048576k, CORE 0k, NPROC 20480, NOFILE 1024, AS infinity load average:1.23 0.44 0.20 CPU:total 1 (1 cores per cpu, 1 threads per core) family 6 model 15 stepping 8, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3 Memory: 4k page, physical 2580404k(957956k free), swap 489940k(489940k free) vm_info: Java HotSpot(TM) 64-Bit Server VM (10.0-b22) for linux-amd64 JRE (1.6.0_06-b02), built on Mar 25 2008 01:03:02 by "java_re" with gcc 3.2.2 (SuSE Linux) time: Thu Nov 6 11:19:55 2008 elapsed time: 29 seconds ================================================================== My test program uses the JniHelper.h and .c files from hadoop-0.19/src/c++/libhdfs. The test program creates buffers to be written out by hdfsWrite. I thought that the main thread's stack is not enough to handle this big buffers so I set the following parameters for the forked JVM: jvm_args: -Xss256M -Xoss256M -XX:ThreadStackSize=262144 -Xms128M -Xmx128M >From the log it can be seen that the main thread's stack still remains 2MB, >though it should be 256MB. I played a bit with the file sizes and as it turned out it works for 1MB, 10 MB, 50 MB, 75MB, doesn't work for 99MB, 100MB, and above. Environmental information. I use hadoop-0.19 from the SVN repository. Ubuntu Gutsy Linux: Linux 2.6.24-19-generic #1 SMP Wed Aug 20 17:53:40 UTC 2008 x86_64 GNU/Linux I run linux under VMware. I use Java 6. I saw previously on the list libhdfs problems with SIGSEGV but I couldn't find the answer to solve my problem.. Thank you in advance for helping me. Cheers, Tamas
