For yarn deployments,  Lets say you have  lets say the container size = 10 GB
 containerized.heap-cutoff-ratio = 0.3  ( = 3GB)
That means 7GB is available for Flinks various subsystems which include,= jvm 
heap, and all the DirectByteBufferAllocatins (netty + netw buff + .. ) and Java 
metadata. 
I am wondering if RocksDB memory allocations (which is C++ native memory 
allocations) are drawn from the 3GB "cutoff" space or it will come from 
whatever is left from the remaining 7GB (i.e left after reserving for above 
mentioned pieces).
-roshan

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