curcur opened a new pull request #15872: URL: https://github.com/apache/flink/pull/15872
## What is the purpose of the change For stop with save point, `StreamTask#advanceToEndOfEventTime()` is called (in source tasks) to advance to the max watermark; However, this is not the case for chained sources in `MultipleInputStreamTask` since `advanceToEndOfEventTime` is not implemented. This PR is to fix this problem. The fix is as follows: Consider `MultipleInputStreamTask` as a chained task with some inputs are sources(StreamTaskSourceInput) and the rest from network(StreamTaskNetworkInput). `MAX_WATERMARK` is injected from the source when advanceToEndOfEventTime is called, together with `MAX_WATERMARK` propagated from the NetworkInput, `MultipleInputStreamTask` emits `MAX_WATERMARK`. ## Verifying this change unit tests ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (no) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (no) - The serializers: (no) - The runtime per-record code paths (performance sensitive): (no) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn/Mesos, ZooKeeper: (no) - The S3 file system connector: (no) -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org