Piotr is right, that depend on the data size you are reading and the memory
pressure. Those memory occupied by mmapped region can be recycled and used
by other processes if memory pressure is high, that is, other process or
service on the same node won't be affected because the OS will recycle the
mmapped pages if needed. But currently, you can't assume a bound of the
memory can be used, because it will use more memory as long as there is free
space and you have more new data to read.



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