hadoop jar $HADOOP_STREAMING -input small-text-file -mapper env -output /tmp/env
Then get the output to local do a sort output | uniq and you will get a list of variables. The one you want may be in there. I don't think setting them has any effect, but I may be wrong.
I found two variables that may be of interest
mapreduce_map_input_length
mapreduce_map_input_start
The related properties should have the same names but with dots instead of underscores.
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