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From "Thejas M Nair (JIRA)" <j...@apache.org>
Subject [jira] Created: (PIG-1492) DefaultTuple and DefaultMemory understimate their memory footprint
Date Sat, 10 Jul 2010 01:39:49 GMT
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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