when we spill the DefaultDataBag we are not setting the sized changed flag to
be true.
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Key: PIG-1307
URL: https://issues.apache.org/jira/browse/PIG-1307
Project: Pig
Issue Type: Bug
Reporter: Benjamin Reed
pig uses a size changed flag to indicate when we should recalculate the memory
footprint of the bag. the setting of this flag is sprinkled throughout the
code. unfortunately, it is missing in DefaultDataBag.spill(). there may be
other cases as well. the problem with this case is that when the low memory
threshold kicks in, bags are spilled until the desired amount of memory is
"freed". since the flag is not being reset subsequent calls to the threshold
events will retrigger the spill() and think more memory was freed even though
nothing was actually spilled.
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