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Crash if mapper or reducer does not yield anything #66

a4tunado opened this Issue · 1 comment

2 participants


Some jobs do not produce any output for ex. uploading input data to external storage or something like this. Dumbo expected that each reducer or mapper yields some data otherwise it leads to crash.

@a4tunado a4tunado closed this
@a4tunado a4tunado reopened this
@a4tunado a4tunado referenced this issue from a commit in a4tunado/dumbo
@a4tunado a4tunado Fix #66 Use empty tupple when return result is None 177eb67

You can create empty generator like this

def reducer(data):
    for key, values in data:
        # do something

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