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https://issues.apache.org/jira/browse/BEAM-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15890861#comment-15890861
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Eugene Kirpichov commented on BEAM-1562:
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See my comment on BEAM-849: as an alternative, we can use "watermarks
progressed to infinity" as a termination signal.
> Use a "signal" to stop streaming tests as they finish.
> ------------------------------------------------------
>
> Key: BEAM-1562
> URL: https://issues.apache.org/jira/browse/BEAM-1562
> Project: Beam
> Issue Type: Improvement
> Components: runner-spark
> Reporter: Amit Sela
> Assignee: Amit Sela
>
> Streaming tests use a timeout that has to take a large enough buffer to avoid
> slow runtimes stopping before test completes.
> We can introduce a "poison pill" based on an {{EndOfStream}} element that
> would be counted in a Metrics/Aggregator to know all data was processed.
> Another option would be to follow the slowest WM and stop once it hits
> end-of-time.
> This requires the Spark runner to stop blocking the execution of a streaming
> pipeline until it's complete - which is something relevant to
> {{PipelineResult}} (re)design that is being discussed in BEAM-849
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