Yet another place to check -- in the hadoop-env.sh file there is also a JAVA_HOME setting. Chris On Jul 17, 2014 9:46 PM, "andrew touchet" <adt...@latech.edu> wrote:
> Hi Fireflyhoo, > > Below I follow the symbolic links for the jdk-7u21. These links are > changed accordingly as I change between versions. Also, I have 8 datanodes > and 2 other various servers that are capable of mounting /hdfs. So it is > just this server is an issue. > > $ java -version > java version "1.7.0_21" > Java(TM) SE Runtime Environment (build 1.7.0_21-b11) > Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode) > > java > $ ls -l `which java` > *lrwxrwxrwx 1 root root 26 Jul 17 19:50 /usr/bin/java -> > /usr/java/default/bin/java* > $ ls -l /usr/java/default > *lrwxrwxrwx 1 root root 16 Jul 17 19:50 /usr/java/default -> > /usr/java/latest* > $ ls -l /usr/java/latest > *lrwxrwxrwx 1 root root 21 Jul 17 20:29 /usr/java/latest -> > /usr/java/jdk1.7.0_21* > > jar > $ ls -l `which jar` > *lrwxrwxrwx 1 root root 21 Jul 17 20:18 /usr/bin/jar -> > /etc/alternatives/jar* > $ ls -l /etc/alternatives/jar > *lrwxrwxrwx 1 root root 29 Jul 17 20:26 /etc/alternatives/jar -> > /usr/java/jdk1.7.0_21/bin/jar* > > javac > $ ls -l `which javac` > *lrwxrwxrwx 1 root root 23 Jul 17 20:18 /usr/bin/javac -> > /etc/alternatives/javac* > $ ls -l /etc/alternatives/javac > *lrwxrwxrwx 1 root root 31 Jul 17 20:26 /etc/alternatives/javac -> > /usr/java/jdk1.7.0_21/bin/javac* > > Now that I've tried version from 6 & 7, I'm really not sure what is > causing this issue. > > > > > > > On Thu, Jul 17, 2014 at 8:21 PM, firefly...@gmail.com < > firefly...@gmail.com> wrote: > >> I think you first confirm you local java version , >> Some liux will pre-installed java ,that version is very low >> >> ------------------------------ >> firefly...@gmail.com >> >> >> *From:* andrew touchet <adt...@latech.edu> >> *Date:* 2014-07-18 09:06 >> *To:* user <user@hadoop.apache.org> >> *Subject:* Re: HDFS input/output error - fuse mount >> Hi Chris, >> >> I tried to mount /hdfs with java versions below but there was no change >> in output. >> jre-7u21 >> jdk-7u21 >> jdk-7u55 >> jdk1.6.0_31 >> jdk1.6.0_45 >> >> >> >> >> On Thu, Jul 17, 2014 at 6:56 PM, Chris Mawata <chris.maw...@gmail.com> >> wrote: >> >>> Version 51 ia Java 7 >>> Chris >>> On Jul 17, 2014 7:50 PM, "andrew touchet" <adt...@latech.edu> wrote: >>> >>>> Hello, >>>> >>>> Hadoop package installed: >>>> hadoop-0.20-0.20.2+737-33.osg.el5.noarch >>>> >>>> Operating System: >>>> CentOS release 5.8 (Final) >>>> >>>> I am mounting HDFS from my namenode to another node with fuse. After >>>> mounting to /hdfs, any attempts to 'ls', 'cd', or use 'hadoop fs' leads to >>>> the below output. >>>> >>>> >>>> $ls /hdfs >>>> *ls: /hdfs: Input/output error* >>>> $hadoop fs -ls >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> *Exception in thread "main" java.lang.UnsupportedClassVersionError: >>>> org/apache/hadoop/fs/FsShell : Unsupported major.minor version 51.0 at >>>> java.lang.ClassLoader.defineClass1(Native Method) at >>>> java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at >>>> java.lang.ClassLoader.defineClass(ClassLoader.java:615) at >>>> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) >>>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at >>>> java.net.URLClassLoader.access$000(URLClassLoader.java:58) at >>>> java.net.URLClassLoader$1.run(URLClassLoader.java:197) at >>>> java.security.AccessController.doPrivileged(Native Method) at >>>> java.net.URLClassLoader.findClass(URLClassLoader.java:190) at >>>> java.lang.ClassLoader.loadClass(ClassLoader.java:306) at >>>> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at >>>> java.lang.ClassLoader.loadClass(ClassLoader.java:247) Could not find the >>>> main class: org.apache.hadoop.fs.FsShell. Program will exit.* >>>> >>>> >>>> I have attempted to mount /hdfs manually in debug mode and then >>>> attempted to access /hdfs from a different terminal. This is the output. >>>> The namenode is *glados*. The server where /hdfs is being mounted is >>>> *glados2*. >>>> >>>> >>>> $hdfs -oserver=glados,port=9000,rdbuffer=131072,allow_other /hdfs -d >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> *fuse-dfs ignoring option allow_otherERROR fuse_options.c:162 fuse-dfs >>>> didn't recognize /hdfs,-2fuse-dfs ignoring option -d unique: 1, opcode: >>>> INIT (26), nodeid: 0, insize: 56INIT: >>>> 7.10flags=0x0000000bmax_readahead=0x00020000INFO fuse_init.c:115 Mounting >>>> glados:9000Exception in thread "main" >>>> java.lang.UnsupportedClassVersionError: >>>> org/apache/hadoop/conf/Configuration : Unsupported major.minor version 51.0 >>>> at java.lang.ClassLoader.defineClass1(Native Method) at >>>> java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at >>>> java.lang.ClassLoader.defineClass(ClassLoader.java:615) at >>>> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) >>>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at >>>> java.net.URLClassLoader.access$000(URLClassLoader.java:58) at >>>> java.net.URLClassLoader$1.run(URLClassLoader.java:197) at >>>> java.security.AccessController.doPrivileged(Native Method) at >>>> java.net.URLClassLoader.findClass(URLClassLoader.java:190) at >>>> java.lang.ClassLoader.loadClass(ClassLoader.java:306) at >>>> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at >>>> java.lang.ClassLoader.loadClass(ClassLoader.java:247) Can't construct >>>> instance of class org.apache.hadoop.conf.ConfigurationERROR fuse_init.c:127 >>>> Unable to establish test connection to server INIT: 7.8 >>>> flags=0x00000001 max_readahead=0x00020000 max_write=0x00020000 >>>> unique: 1, error: 0 (Success), outsize: 40unique: 2, opcode: GETATTR (3), >>>> nodeid: 1, insize: 56Exception in thread "Thread-0" >>>> java.lang.UnsupportedClassVersionError: >>>> org/apache/hadoop/conf/Configuration : Unsupported major.minor version 51.0 >>>> at java.lang.ClassLoader.defineClass1(Native Method) at >>>> java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at >>>> java.lang.ClassLoader.defineClass(ClassLoader.java:615) at >>>> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:141) >>>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:283) at >>>> java.net.URLClassLoader.access$000(URLClassLoader.java:58) at >>>> java.net.URLClassLoader$1.run(URLClassLoader.java:197) at >>>> java.security.AccessController.doPrivileged(Native Method) at >>>> java.net.URLClassLoader.findClass(URLClassLoader.java:190) at >>>> java.lang.ClassLoader.loadClass(ClassLoader.java:306) at >>>> sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at >>>> java.lang.ClassLoader.loadClass(ClassLoader.java:247) Can't construct >>>> instance of class org.apache.hadoop.conf.ConfigurationERROR >>>> fuse_connect.c:83 Unable to instantiate a filesystem for user027ERROR >>>> fuse_impls_getattr.c:40 Could not connect to glados:9000 unique: 2, >>>> error: -5 (Input/output error), outsize: 16 unique: 3, opcode: GETATTR (3), >>>> nodeid: 1, insize: 56* >>>> >>>> I adopted this system after this was already setup, so I do not know >>>> which java version was used during install. Currently I'm using: >>>> >>>> $java -version >>>> >>>> >>>> *java version "1.6.0_45"Java(TM) SE Runtime Environment (build >>>> 1.6.0_45-b06)Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed >>>> mode)* >>>> >>>> $java -version >>>> >>>> >>>> >>>> >>>> >>>> *java version "1.6.0_45" Java(TM) SE Runtime Environment (build >>>> 1.6.0_45-b06)Java HotSpot(TM) 64-Bit Server VM (build 20.45-b01, mixed >>>> mode)* >>>> Is my java version really the cause of this issue? What is the correct >>>> java version to be used for this version of hadoop. I have also tried >>>> 1.6.0_31 but no changes were seen. >>>> >>>> If java isn't my issue, then what is? >>>> >>>> Best regards, >>>> >>>> Andrew >>>> >>>> >>>> >>>> >>>> >> >
