How to read the information on namenode page

[Yue Guan <pi...@gmail.com>]

Hi, there

I try to understand information presented on Namenode page.

I see the Heap Size is always 100% what does that mean? Does that mean 
the namenode takes up all the memory it's assigned to?

I can figure out Configured Capacity = DFS Used + Non DFS Used + DFS 
Remaining. My question here is: Does Configured Capacity change during 
the time (assume nothing changed, no more disk change?)?

Thank you!