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From andrew touchet <adt...@latech.edu>
Subject Re: Re: HDFS input/output error - fuse mount
Date Fri, 18 Jul 2014 01:45:55 GMT
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, fireflyhoo@gmail.com <fireflyhoo@gmail.com>
wrote:

> I think  you first confirm you local java version ,
> Some  liux will  pre-installed java ,that version is very low
>
> ------------------------------
> fireflyhoo@gmail.com
>
>
> *From:* andrew touchet <adt027@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.mawata@gmail.com>
> wrote:
>
>> Version 51 ia Java 7
>> Chris
>> On Jul 17, 2014 7:50 PM, "andrew touchet" <adt027@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
>>>
>>>
>>>
>>>
>>>
>

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