That JDK is unstable. I would highly recommend 1.6.0_16. I would also use the Sun JVM and not OpenJDK that comes with CentOS. There are differences. You can find JDK 6 u 16 here.
http://java.sun.com/products/archive/j2se/6u16/index.html ________________________________________ From: Richard Lackey [[email protected]] Sent: Friday, August 13, 2010 3:06 PM To: [email protected] Subject: Re: namenode crash 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 [email protected] 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. > >
