Github user andrewor14 commented on a diff in the pull request:
https://github.com/apache/spark/pull/10934#discussion_r51330811
--- Diff:
streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala ---
@@ -821,6 +821,70 @@ class CheckpointSuite extends TestSuiteBase with
DStreamCheckpointTester
checkpointWriter.stop()
}
+ test("SPARK-6847: stack overflow when updateStateByKey is followed by a
checkpointed dstream") {
+ // In this test, there are two updateStateByKey operators. The RDD DAG
is as follows:
+ //
+ // batch 1 batch 2 batch 3 ...
+ //
+ // 1) input rdd input rdd input rdd
+ // | | |
+ // 2) cogroup rdd ---> cogroup rdd ---> cogroup rdd ...
+ // | / | / |
+ // 3) map rdd --- map rdd --- map rdd ...
+ // |
+ // 4) cogroup rdd ---> cogroup rdd ---> cogroup rdd ...
+ // | / | / |
+ // 5) map rdd --- map rdd --- map rdd ...
--- End diff --
Beautiful!! One thing I would suggest is adding the direction of the down
arrow if possible, i.e.:
```
a
|
v
b
```
instead of
```
a
|
b
```
so it's clearer which one is the parent
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