Hardware configuration

[Iulia Zidaru]

 Hi,
I'm wondering if having a cluster with different machines in terms of 
CPU, RAM and disk space would be a big issue for HBase. For example, 
machines with 12GBs RAM and machines with 48GBs. We suppose that we use 
them at full capacity. What problems we might encounter if having this 
kind of configuration?
Thank you,
Iulia