Github user tdas commented on a diff in the pull request: https://github.com/apache/spark/pull/10934#discussion_r50933818 --- Diff: streaming/src/test/scala/org/apache/spark/streaming/CheckpointSuite.scala --- @@ -821,6 +821,33 @@ class CheckpointSuite extends TestSuiteBase with DStreamCheckpointTester checkpointWriter.stop() } + test("SPARK-6847: stack overflow when updateStateByKey is followed by a checkpointed dstream") { + ssc = new StreamingContext(master, framework, batchDuration) + val batchCounter = new BatchCounter(ssc) + ssc.checkpoint(checkpointDir) + val inputDStream = new CheckpointInputDStream(ssc) + val updateFunc = (values: Seq[Int], state: Option[Int]) => { + Some(values.sum + state.getOrElse(0)) + } + @volatile var recursiveCheckpoint = false + @volatile var rddsBothCheckpointed = false + inputDStream.map(i => (i, i)). + updateStateByKey[Int](updateFunc).checkpoint(batchDuration). + map(i => i).checkpoint(batchDuration). --- End diff -- would you test this using two updateStateByKey also this code style is weird and hard to read.
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