DefaultTuple and DefaultMemory understimate their memory footprint
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Key: PIG-1492
URL: https://issues.apache.org/jira/browse/PIG-1492
Project: Pig
Issue Type: Bug
Reporter: Thejas M Nair
There are several places where we highly underestimate the memory footprint .
For example, for map datatypes, we don't account for the per entry cost for the
map container data structures. The estimated size of a tuple having map with
100 integer key-value entries , as per current version of code is 3260 bytes,
while what is observed is around 6775 bytes . To verify the memory footprint,
i checked free memory before and after creating multiple instances of the
object , using code on the lines of
http://www.javaspecialists.eu/archive/Issue029.html .
In PIG-1443 similar change was done to fix this for CHARARRAY .
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