- ExternalSpillableMap does the payload/value size estimation on the first put to
determine when to spill over to disk map. The payload size re-estimation also
happens after a minimum threshold of puts. This size re-estimation goes my the
current in-memory map size for calculating average payload size and does attempts
divide by zero operation when the map is size is empty. Avoiding the
ArithmeticException during the payload size re-estimate by checking the map size
upfront.
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