I think you first confirm you local java version , Some liux will pre-installed java ,that version is very low
[email protected] From: andrew touchet Date: 2014-07-18 09:06 To: user 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 <[email protected]> wrote: Version 51 ia Java 7 Chris On Jul 17, 2014 7:50 PM, "andrew touchet" <[email protected]> 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_other ERROR fuse_options.c:162 fuse-dfs didn't recognize /hdfs,-2 fuse-dfs ignoring option -d unique: 1, opcode: INIT (26), nodeid: 0, insize: 56 INIT: 7.10 flags=0x0000000b max_readahead=0x00020000 INFO fuse_init.c:115 Mounting glados:9000 Exception 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.Configuration ERROR 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: 40 unique: 2, opcode: GETATTR (3), nodeid: 1, insize: 56 Exception 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.Configuration ERROR fuse_connect.c:83 Unable to instantiate a filesystem for user027 ERROR 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
