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https://issues.apache.org/jira/browse/BEAM-1737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15956637#comment-15956637
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Amit Sela commented on BEAM-1737:
---------------------------------
Changed the title since the change will actually do just that.
> Implement a Single-output ParDo as a Multi-output ParDo with a single output
> ----------------------------------------------------------------------------
>
> Key: BEAM-1737
> URL: https://issues.apache.org/jira/browse/BEAM-1737
> Project: Beam
> Issue Type: Bug
> Components: runner-spark
> Reporter: Thomas Groh
> Assignee: Amit Sela
> Priority: Minor
>
> This is the cause of having a separate path and implementation for
> single-output ParDos, even though both go through the same translator.
> Partial stacktrace:
> Tests run: 9, Failures: 0, Errors: 6, Skipped: 0, Time elapsed: 5.946 sec <<<
> FAILURE! - in
> org.apache.beam.runners.spark.translation.streaming.CreateStreamTest
> [8233/41535]
> testLateDataAccumulating(org.apache.beam.runners.spark.translation.streaming.CreateStreamTest)
> Time elapsed: 3.593 sec <<< ERROR!
> java.lang.RuntimeException:
> java.io.NotSerializableException: DStream checkpointing has been enabled but
> the DStreams with their functions are not serializable
> org.apache.beam.runners.spark.translation.EvaluationContext
> Serialization stack:
> - object not serializable (class:
> org.apache.beam.runners.spark.translation.EvaluationContext, value:
> org.apache.beam.runners.spark.translation.EvaluationContext@a8c55d7)
> - field (class:
> org.apache.beam.runners.spark.translation.streaming.StreamingTransformTranslator$8$1,
> name: val$context, type: class
> org.apache.beam.runners.spark.translation.EvaluationContext)
> - object (class
> org.apache.beam.runners.spark.translation.streaming.StreamingTransformTranslator$8$1,
>
> org.apache.beam.runners.spark.translation.streaming.StreamingTransformTranslator$8$1@44f50940)
> - field (class:
> org.apache.spark.streaming.api.java.JavaDStreamLike$$anonfun$transformToPair$1,
> name: transformFunc$3, type: interface
> org.apache.spark.api.java.function.Function)
> - object (class
> org.apache.spark.streaming.api.java.JavaDStreamLike$$anonfun$transformToPair$1,
> <function1>)
> - field (class:
> org.apache.spark.streaming.dstream.DStream$$anonfun$transform$1$$anonfun$apply$21,
> name: cleanedF$2, type: interface scala.Function1)
> - object (class
> org.apache.spark.streaming.dstream.DStream$$anonfun$transform$1$$anonfun$apply$21,
> <function2>)
> - field (class:
> org.apache.spark.streaming.dstream.DStream$$anonfun$transform$2$$anonfun$5,
> name: cleanedF$3, type: interface scala.Function2)
> - object (class
> org.apache.spark.streaming.dstream.DStream$$anonfun$transform$2$$anonfun$5,
> <function2>)
> - writeObject data (class:
> org.apache.spark.streaming.dstream.DStreamCheckpointData)
> - object (class
> org.apache.spark.streaming.dstream.DStreamCheckpointData, [
> 0 checkpoint files
> ])
> ....
> at
> org.apache.beam.runners.spark.SparkPipelineResult.runtimeExceptionFrom(SparkPipelineResult.java:60)
> at
> org.apache.beam.runners.spark.SparkPipelineResult.beamExceptionFrom(SparkPipelineResult.java:77)
> at
> org.apache.beam.runners.spark.SparkPipelineResult.waitUntilFinish(SparkPipelineResult.java:113)
> at
> org.apache.beam.runners.spark.TestSparkRunner.awaitWatermarksOrTimeout(TestSparkRunner.java:195)
> at
> org.apache.beam.runners.spark.TestSparkRunner.run(TestSparkRunner.java:127)
> at
> org.apache.beam.runners.spark.TestSparkRunner.run(TestSparkRunner.java:82)
> at org.apache.beam.sdk.Pipeline.run(Pipeline.java:210)
> ...
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