On Sat, Sep 25, 2010 at 9:32 PM, baggio liu <[email protected]> wrote: > Hi HBaser, > we meet a problem when a meta region down then another region server load > region. a region server core.
It core dumps? > out machine enviroment: > 8 cores CPU, 48G memory, 12 1T disks > our region server heap size : 36000 > jdk > java version "1.6.0_07" This is an old JVM. A lot of bugs have been fixed since this version was released. Can you update? Especially given you have so many cores and a bunch of RAM. > Java(TM) SE Runtime Environment (build 1.6.0_07-b06) > Java HotSpot(TM) 64-Bit Server VM (build 10.0-b23, mixed mode) > our jvm parameter like below: > -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+UseCMSCompactAtFullCollection > -XX:CMSFullGCsBeforeCompaction=0 -XX:+CMSClassUnloadingEnabled > -XX:-CMSParallelRemarkEnabled -XX:CMSInitiatingOccupancyFraction=70 > -XX:SoftRefLRUPolicyMSPerMB=0 -XX:MaxTenuringThreshold=7 > This looks like an interesting configuration. How did you arrive at it (especially max tenuring threshold = 7 and cmsfulgcsbeforecompaction). And I attach hs_err.log > Has anyone met this issue ?? > or If I can get your jdk version and cluster environment is more > pleasure. > At SU we run u14. u18 is generally regarded as bad. u20 may have issues. u21, the latest, purportedly has some improved heuristics to help w/ heap fragmentation. Try updating the jvm first. St.Ack > Thanks & Best regards > LiuJinglong > > > > >
