Kevin Wan bbb9126302 fix golint issues in core/mr (#500) %!s(int64=3) %!d(string=hai) anos
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mapreduce.go bbb9126302 fix golint issues in core/mr (#500) %!s(int64=3) %!d(string=hai) anos
mapreduce_test.go 1cb17311dd add unit test for mapreduce %!s(int64=4) %!d(string=hai) anos