Thanks for the prompt reply.
May I ask why the keyBy(f) is not supported in DStreams? any particular
reason?
or is it possible to add it in future release since that "stream.map(record
=> (keyFunction(record), record))" looks tedious.
I checked the python source code, KeyBy looks like a "shortcut" method.
maybe people are more familiar with it.
def keyBy(self, f):
"""
Creates tuples of the elements in this RDD by applying C{f}.
>>> x = sc.parallelize(range(0,3)).keyBy(lambda x: x*x)
>>> y = sc.parallelize(zip(range(0,5), range(0,5)))
>>> [(x, list(map(list, y))) for x, y in
sorted(x.cogroup(y).collect())]
[(0, [[0], [0]]), (1, [[1], [1]]), (2, [[], [2]]), (3, [[], [3]]),
(4, [[2], [4]])]
"""
return self.map(lambda x: (f(x), x))
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