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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/10/13 23:41:34 UTC
[GitHub] [beam] lukecwik opened a new pull request #13101: [WIP] Spark Watermarks
lukecwik opened a new pull request #13101:
URL: https://github.com/apache/beam/pull/13101
------------------------
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[GitHub] [beam] github-actions[bot] commented on pull request #13101: [WIP] Spark Watermarks
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on pull request #13101:
URL: https://github.com/apache/beam/pull/13101#issuecomment-1039043964
This pull request has been closed due to lack of activity. If you think that is incorrect, or the pull request requires review, you can revive the PR at any time.
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[GitHub] [beam] github-actions[bot] closed pull request #13101: [WIP] Spark Watermarks
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #13101:
URL: https://github.com/apache/beam/pull/13101
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[GitHub] [beam] echauchot commented on a change in pull request #13101: [WIP] Spark Watermarks
Posted by GitBox <gi...@apache.org>.
echauchot commented on a change in pull request #13101:
URL: https://github.com/apache/beam/pull/13101#discussion_r518660241
##########
File path: runners/spark/src/main/java/org/apache/beam/runners/spark/stateful/SparkGroupAlsoByWindowViaWindowSet.java
##########
@@ -345,15 +360,27 @@ public void outputWindowedValue(
// empty outputs are filtered later using DStream filtering
final StateAndTimers updated =
new StateAndTimers(
+ stateInternals.getWatermarkHoldStates(),
stateInternals.getState(),
SparkTimerInternals.serializeTimers(
timerInternals.getTimers(), timerDataCoder));
+ Instant lowerBound = timerInternals.currentInputWatermarkTime();
Review comment:
First a point on terms: lowWatermark is the outputWatermark and highWatermark is the inputWatermark because the output WM is always lower than the input WM right ?
Now, one interrogation: in the for loop, you select the minimum states time that are before the current input WM, that means that such elements are the one buffered in the groupby operation waiting to be output. So then you set spark global watermark to this lower bound so that the elements are not dropped right ?
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[GitHub] [beam] lukecwik commented on pull request #13101: [WIP] Spark Watermarks
Posted by GitBox <gi...@apache.org>.
lukecwik commented on pull request #13101:
URL: https://github.com/apache/beam/pull/13101#issuecomment-708069800
@iemejia @echauchot
I added some very rudimentary support for watermark holds influencing the output watermark. Most but not all of the existing validatesRunnerStreaming tests work but a few get stuck with the watermark not advancing to infinity.
I also tried running the ImpulseTest from the `ValidatesRunner` junit category and it fails because it thinks there aren't any output operators registered:
```
java.lang.IllegalArgumentException: requirement failed: No output operations registered, so nothing to execute
```
I would have suspected that the [EvaluationContext#computeOutputs](https://github.com/apache/beam/blob/42aff4d55954f63405a67956e0c6884e2347d772/runners/spark/src/main/java/org/apache/beam/runners/spark/translation/EvaluationContext.java#L222) would have forced the leaves to be computed.
repro by checking this PR out and running:
```
./gradlew :runners:spark:validatesRunnerStreaming2 --tests "org.apache.beam.sdk.transforms.ImpulseTest"
```
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[GitHub] [beam] echauchot commented on pull request #13101: [WIP] Spark Watermarks
Posted by GitBox <gi...@apache.org>.
echauchot commented on pull request #13101:
URL: https://github.com/apache/beam/pull/13101#issuecomment-722432357
@lukecwik thanks for that ! I'll take a look
But before, as it is still a WIP, I'll look at your other spark PR https://github.com/apache/beam/pull/13061
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[GitHub] [beam] github-actions[bot] commented on pull request #13101: [WIP] Spark Watermarks
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on pull request #13101:
URL: https://github.com/apache/beam/pull/13101#issuecomment-1030825429
This pull request has been marked as stale due to 60 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@beam.apache.org list. Thank you for your contributions.
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