memory for map task

[Gang Luo]

Hi all,
the parameter mapred.child.java.opts defines the memory for each task (e.g. 
200mb), while io.sort.mb defines the memory size for sorting (e.g. 100mb). So, 
for each map task, the task memory minus io memory is the maximum memory the 
map function can use. Is it correct?

-Gang



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