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From Richard Lackey <richlac...@roamingcloud.com>
Subject Re: namenode crash
Date Fri, 13 Aug 2010 20:06:10 GMT
I am using CentOS 5.5 with suggested updates. JDK 1.6.0_21, JRE 1.6.0_21 all x64

Rich

Rich Lackey
RoamingCloud, LLC
President, CTO

408-373-7772
richlackey@roamingcloud.com



On Aug 13, 2010, at 1:27 PM, Jinsong Hu wrote:

> 
> 
> Hi, There:
>  does anybody know of a good combination of centos version and jdk version that works
stably ? I am using centos version
> 
> Linux  2.6.18-194.8.1.el5.centos.plus #1 SMP Wed Jul 7 11:45:38 EDT 2010
> x86_64 x86_64 x86_64 GNU/Linux
> 
> jdk version
> Java(TM) SE Runtime Environment (build 1.6.0_17-b04)
> Java HotSpot(TM) 64-Bit Server VM (build 14.3-b01, mixed mode)
> 
> and run the namenode with the following jvm config 
> -Xmx1000m  -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:+DisableExplicitGC -XX:+HeapDumpOnOutOfMemoryError
-XX:+UseCompressedOops -XX:+DoEscapeAnalysis -XX:+AggressiveOpts  -Xmx2G
> 
> but it crashed silently after 16 hours. 
> 
> I used jdk 
> Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
> Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)
> 
> with the same jvm config, and the namenode crashed in about 1 week. I searched internet
and people say 1.6.0_18 is not good. 
> but does anybody can recommend a good combination of jdk and os version that can run
stably ?
> 
> 
> This crashing problem doesn't happen with a small cluster of 4 datanodes. but it happens
with a cluster of 17 datanodes.
> 
> Jimmy.
> 
> 


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