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From "Jinsong Hu" <jinsong...@hotmail.com>
Subject namenode crash in centos. can anybody recommend jdk ?
Date Fri, 13 Aug 2010 18:41:31 GMT

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.


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