Minor Description
NodeManagerHardwareUtils.getContainerMemoryMB has the following javadoc:
"If the OS has a
* ResourceCalculatorPlugin implemented, the calculation is 0.8 * (RAM - 2 *
* JVM-memory) i.e. use 80% of the memory after accounting for memory used by
* the DataNode and the NodeManager. If the number is less than 1GB, log a
* warning message."
I think the accurate expression is 0.8*(RAM-2*JVM)-systemreserved. I also do not see the 1GB cap in the code.