never mind, I found it, I was trying to dump out the entire keyspace of 1mil rows, which is not that big, but somehow caused the GC to bring down the server
http://stackoverflow.com/questions/3895940/what-does-java-vm-thread-do On Thu, Aug 4, 2011 at 1:02 PM, Yang <teddyyyy...@gmail.com> wrote: > I'm running my cassandra cluster (one node), it went fine for a while > under heavy load , using 270% CPU etc (this is a multi-core machine). > but after a while, the CPU utilization dropped to 100%, and the > cluster stopped responding to requests. > > I did a jstack , and did > > ps ax -L -o tid,pid,%cpu,command|less > > > I found that one thread is taking 45% of CPU, and the corresponding > entry in the jstack output is: > > > "VM Thread" prio=10 tid=0x09a50400 nid=0x1a1a runnable > > > what is the "VM Thread" ? > youkit dump does not show a thread with this name > > Thanks > Yang >
