The same configurations to both servers are not always mean the same usage of 
memory in clusting.It also infected by the client requests each web server 
serves.

And in clusting,the requests each worker node serves are defined by the 
"lbfactor" directive,see below:

workers.properties

  | # Define Node1
  | worker.node1.port=8009
  | worker.node1.host=192.168.10.128
  | worker.node1.type=ajp13
  | worker.node1.lbfactor=1
  | 
  | # Define Node2
  | worker.node2.port=8009
  | worker.node2.host= 192.168.10.129
  | worker.node2.type=ajp13
  | worker.node2.lbfactor=3

As you can see as above,the node2(lbfactor=3) will serve three times requests 
more than the node1(lbfactor=1).In this situation,the memory usage of node2 
maybe more than node1 depends your app.

Hope this will help you. 

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