If you just want to see to utilization and monitor it for some time try
Java Visual JVM
and connect to JMX port . it will show you the heap uses and other details
These tools you can find in jdk bin folder
On Tue, Feb 5, 2013 at 10:34 PM, Dhanasekaran Anbalagan
> Hi Guys,
> We have configured many Heap size related thing. in Hadoop for ex.
> Namenode's Java Heap Size in bytes.
> Secondary namenode's Java Heap Size in bytes.
> Balancer's Java Heap Size in bytes.
> HttpFS's Java Heap Size in bytes.
> Failover Controller's Java Heap Size in bytes.
> MapReduce Child Java Maximum Heap Size
> Reduce Task Maximum Heap Siz
> TaskTracker's Java Heap Size in bytes.
> When i start my cluster these guys occupy the large number of memory, Best
> way handle or fine tune these parameter. please guide me.
> Bes monitor those configuration.
> Any graphical tool to help us to monitor?
> Did I learn something today? If not, I wasted it.