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From "Amit Sela (JIRA)" <>
Subject [jira] [Commented] (BEAM-853) Force streaming execution on batch pipelines for testing.
Date Sat, 19 Nov 2016 19:03:58 GMT


Amit Sela commented on BEAM-853:

Streaming tests require forcing streaming mode on {{BoundedFromUnbounded}}, and {{PAssert}}
requires proper {{GroupByKey}} implementation, so those two go together.

> Force streaming execution on batch pipelines for testing.
> ---------------------------------------------------------
>                 Key: BEAM-853
>                 URL:
>             Project: Beam
>          Issue Type: Bug
>          Components: runner-spark
>            Reporter: Amit Sela
>            Assignee: Amit Sela
> Beam's {{RunnableOnService}} tests for runners are written with bounded reads so the
SparkRunner should force a streaming pipeline on an "all-batch" pipeline. 
> Currently the runner will decide the translation (batch/streaming) according to the input
PCollection boundness (in case of input, according to output).
> One way to overcome this would be to override this behaviour in {{TestSparkRunner}}.
> Another challenge is the implementation itself - we could clearly read the RDD and create
a single-RDD-DStream of it (following RDDs will be empty) but this will miss the point of
testing streaming pipelines both for testing the execution of {{Read.Unbounded}} and for testing
across-microbatches (tests state management).
> Finally, we have to consider how this is going to play nicely with {{SplittableDoFn}}.

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