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Sahara: Change Java heap space

Hi everybody,

I have created a cluster hadoop (When create Node group template, I have modified "-Xmx200m" to "-Xmx1024m"). Then i ssh to master-instance and run: "hadoop jar hadoop-examples-1.2.1.jar pi 10 100", I get the error:

java.lang.OutOfMemoryError: Java heap space

Check file /etc/hadoop/ I see:


Then, I edit 128 to 1024:


When run "hadoop jar hadoop-examples-1.2.1.jar pi 10 100", it's worked! But, my cluster still in a state: "Watting" and ip_master:50030/jobtracker.jps not running?

Why HADOOP_CLIENT_OPTS in /etc/hadoop/ not automatic update when create cluster?

What is the problem here? Thank you very much!