automatic monitoring the utilization of slaves

[bikash sharma]

Hi -- Is there a way, by which a slave can get a trigger when a Hadoop jobs
finished in master?
The use case is as follows:
I need to monitor the cpu, memory utilization utility automatically. For
which, I need to know the timestamp to start and stop the sar utility
corresponding to the start and finish of Hadoop job at master.
Its simple to do at master, since the Hadoop job runs there, but how we do
for slaves?

Thanks.
Bikash