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Posted to github@beam.apache.org by GitBox <gi...@apache.org> on 2020/10/27 21:28:38 UTC
[GitHub] [beam] scwhittle opened a new pull request #13206: [BEAM-11143] Ensure that AfterWatermarkStateMachine clears late trigg…
scwhittle opened a new pull request #13206:
URL: https://github.com/apache/beam/pull/13206
…er state
for merged away windows.
Previously the trigger state was cleared with the mergecontext directly which cleared it for the merged-to window namespace, while leaving state in the merged-from window namespaces. Since the merged away windows were then removed from the window set and forgotten, this state could be never cleaned up.
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[GitHub] [beam] kennknowles merged pull request #13206: [BEAM-11143] Ensure that AfterWatermarkStateMachine clears late trigg…
Posted by GitBox <gi...@apache.org>.
kennknowles merged pull request #13206:
URL: https://github.com/apache/beam/pull/13206
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[GitHub] [beam] scwhittle commented on pull request #13206: [BEAM-11143] Ensure that AfterWatermarkStateMachine clears late trigg…
Posted by GitBox <gi...@apache.org>.
scwhittle commented on pull request #13206:
URL: https://github.com/apache/beam/pull/13206#issuecomment-717553720
R: @kennknowles
This was impacting a dataflow customer. As I was debugging I also found https://issues.apache.org/jira/browse/BEAM-11144 but I plan on doing that separately. Both of these issues show how the contexts and the namespace used can be confusing. To debug I made changes to ReduceFnRunner to validate that the in-memory state was all empty at the end of certain tests. Let me know if you'd like me to include that here. It would be nice to have support in ValidateRunner tests that it didn't leak state, does that exist or do you have any ideas?
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[GitHub] [beam] kennknowles commented on pull request #13206: [BEAM-11143] Ensure that AfterWatermarkStateMachine clears late trigg…
Posted by GitBox <gi...@apache.org>.
kennknowles commented on pull request #13206:
URL: https://github.com/apache/beam/pull/13206#issuecomment-720678222
IIRC there are some DirectRunner tests around leaking state. It doesn't quite fit with "ValidatesRunner" because `runners-core` is a utility library that is an optional implementation detail, not an externally observable behavior. A runner isn't required to use this form of state at all, or Java, etc. I know of at least one runner that does its triggering outside of Java, but indeed most of them _will_ use this indefinitely.
With regard to runners-core and `ReduceFnRunner`, I agree that all the contexts and namespaces can be quite confusing. The code is quite obscure, especially considering how elementary the actual functionality. Once or twice I've tried to untangle it but failed each time. A major refactor or rewrite might actually be easier than incremental simplification. I'd want to get a clearer test suite that is truly the spec for triggers before doing that. Basically the spirit of `ReduceFnRunnerTest` but expressed as external `TestStream`-based end-to-end behavioral tests instead of heavily mocked out (hence unreliable) unit tests. This won't improve the ability to introspect intermediate state but it will make the code simpler.
Meanwhile, I do think it is reasonable to add accessors to the various internal contexts and have `ReduceFnRunner` assert things about its own behavior. As long as it stays "in bounds" and only asserts things that it really controls and that cannot vary across different uses of `ReduceFnRunner`.
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