Repository: spark Updated Branches: refs/heads/branch-1.5 9957925e4 -> 001c44667
[SPARK-11812][PYSPARK] invFunc=None works properly with python's reduceByKeyAndWindow invFunc is optional and can be None. Instead of invFunc (the parameter) invReduceFunc (a local function) was checked for trueness (that is, not None, in this context). A local function is never None, thus the case of invFunc=None (a common one when inverse reduction is not defined) was treated incorrectly, resulting in loss of data. In addition, the docstring used wrong parameter names, also fixed. Author: David Tolpin <[email protected]> Closes #9775 from dtolpin/master. (cherry picked from commit 599a8c6e2bf7da70b20ef3046f5ce099dfd637f8) Signed-off-by: Tathagata Das <[email protected]> Project: http://git-wip-us.apache.org/repos/asf/spark/repo Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/001c4466 Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/001c4466 Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/001c4466 Branch: refs/heads/branch-1.5 Commit: 001c4466770de87fac2a8b55ed9ca07fe4d2faed Parents: 9957925 Author: David Tolpin <[email protected]> Authored: Thu Nov 19 13:57:23 2015 -0800 Committer: Tathagata Das <[email protected]> Committed: Thu Nov 19 13:57:51 2015 -0800 ---------------------------------------------------------------------- python/pyspark/streaming/dstream.py | 6 +++--- python/pyspark/streaming/tests.py | 11 +++++++++++ 2 files changed, 14 insertions(+), 3 deletions(-) ---------------------------------------------------------------------- http://git-wip-us.apache.org/repos/asf/spark/blob/001c4466/python/pyspark/streaming/dstream.py ---------------------------------------------------------------------- diff --git a/python/pyspark/streaming/dstream.py b/python/pyspark/streaming/dstream.py index 698336c..acec850 100644 --- a/python/pyspark/streaming/dstream.py +++ b/python/pyspark/streaming/dstream.py @@ -524,8 +524,8 @@ class DStream(object): `invFunc` can be None, then it will reduce all the RDDs in window, could be slower than having `invFunc`. - @param reduceFunc: associative reduce function - @param invReduceFunc: inverse function of `reduceFunc` + @param func: associative reduce function + @param invFunc: inverse function of `reduceFunc` @param windowDuration: width of the window; must be a multiple of this DStream's batching interval @param slideDuration: sliding interval of the window (i.e., the interval after which @@ -556,7 +556,7 @@ class DStream(object): if kv[1] is not None else kv[0]) jreduceFunc = TransformFunction(self._sc, reduceFunc, reduced._jrdd_deserializer) - if invReduceFunc: + if invFunc: jinvReduceFunc = TransformFunction(self._sc, invReduceFunc, reduced._jrdd_deserializer) else: jinvReduceFunc = None http://git-wip-us.apache.org/repos/asf/spark/blob/001c4466/python/pyspark/streaming/tests.py ---------------------------------------------------------------------- diff --git a/python/pyspark/streaming/tests.py b/python/pyspark/streaming/tests.py index 887106f..41f94af 100644 --- a/python/pyspark/streaming/tests.py +++ b/python/pyspark/streaming/tests.py @@ -448,6 +448,17 @@ class WindowFunctionTests(PySparkStreamingTestCase): self.assertRaises(ValueError, lambda: d1.reduceByKeyAndWindow(None, None, 0.1, 0.1)) self.assertRaises(ValueError, lambda: d1.reduceByKeyAndWindow(None, None, 1, 0.1)) + def test_reduce_by_key_and_window_with_none_invFunc(self): + input = [range(1), range(2), range(3), range(4), range(5), range(6)] + + def func(dstream): + return dstream.map(lambda x: (x, 1))\ + .reduceByKeyAndWindow(operator.add, None, 5, 1)\ + .filter(lambda kv: kv[1] > 0).count() + + expected = [[2], [4], [6], [6], [6], [6]] + self._test_func(input, func, expected) + class StreamingContextTests(PySparkStreamingTestCase): --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
