On Sat, May 4, 2013 at 9:22 PM, Aiman Parvaiz <aiman@grapheffect.com> wrote:

When starting this cluster we set 
> JVM_OPTS="$JVM_OPTS -Xss1000k"

Why did you increase the stack-size to 5.5 times greater than recommended?  Since each threads now uses 1000KB minimum just for the stack, a large number of threads will use a large amount of memory.