As it so often happens, I went out for a walk and came back to look at a few other things. And sure enough, I now see this would be how you tune the job. I guess if any good can come from my lack of attention to detail, at least I now have it engraved in my mind. sqoop import -D mapreduce.map.memory.mb=4096 -D mapreduce.map.java.opts=-Xmx3000m ....
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