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Date: Sun, 25 May 2008 21:55:25 -0700 (PDT)
From: jkupferman <jkupferman@umail.ucsb.edu>
To: core-user@hadoop.apache.org
Subject: Re: Which version of Java for Hadoop 0.16.x?
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I am using java 1.6. According to the excellent michael noll tutorial
(http://www.michael-noll.com/wiki/Running_Hadoop_On_Ubuntu_Linux_%28Single-Node_Cluster%29)
it is recommended to use 1.6 over 1.5


C G-4 wrote:
> 
> Folks:
>    
>   What version of the JVM/JDK is everyone running in order to run Hadoop
> 0.16.x (specifically .4 in my case)?  
>    
>   We're running:
>   java version "1.6.0_02"
> Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
> Java HotSpot(TM) Server VM (build 1.6.0_02-b05, mixed mode)
>    
>   and I'm seeing DataNodes crash under moderately heavy load (processing
> 250G of input data) with errors like:
>   # An unexpected error has been detected by Java Runtime Environment:
> #
> #  Internal Error (4E4D4554484F440E435050071F), pid=31202, tid=413023120
> #
> # Java VM: Java HotSpot(TM) Server VM (1.6.0_02-b05 mixed mode)
> # 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 (0x86b7fc00):  JavaThread
> "org.apache.hadoop.dfs.DataNode$DataXceiver@125e3e9" daemon
> [_thread_in_Java, id=3795]
>   Stack: [0x18993000,0x189e4000),  sp=0x189e28f0,  free space=318k
> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native
> code)
> V  [libjvm.so+0x53b707]
> V  [libjvm.so+0x225f2f]
> V  [libjvm.so+0x4413ec]
> V  [libjvm.so+0x4ae0fa]
> V  [libjvm.so+0x454290]
> V  [libjvm.so+0x4518f8]
> 
>    
>   So I'm curious who is running 0.16.4 and what version of Java is being
> used.
>    
>   Thanks,
>   C G
>    
>    
> 
>        
> 

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