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From Jean-Daniel Cryans <jdcry...@apache.org>
Subject Re: Fw: namenode crash
Date Fri, 13 Aug 2010 18:54:33 GMT
u18 should never be used.

You say it's crashing on both u17 and u20? How is it crashing? (it's
kind of a vague word)

Here with use both u14 and u17 on 20 nodes clusters without any issue.

J-D

On Fri, Aug 13, 2010 at 11:27 AM, Jinsong Hu <jinsong_hu@hotmail.com> 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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