GitHub user xccui opened a pull request: https://github.com/apache/flink/pull/4530
[FLINK-7245] [stream] Support holding back watermarks with static delays ## What is the purpose of the change *This pull request aims to allow the operators to support holding back watermarks with **static** delays.* ## Brief change log - *Introduce a new method `getWatermarkToEmit(Watermark inputWatermark)`, which allows to generate a new watermark with different timestamp before emitting it.* - *Add two operators `KeyedProcessOperatorWithWatermarkDelay` and `KeyedCoProcessOperatorWithWatermarkDelay` that support holding back watermarks with static delays.* ## Verifying this change This change is verified by two new test classes `KeyedProcessOperatorWithWatermarkDelayTest` and `KeyedCoProcessOperatorWithWatermarkDelayTest`. They test whether watermarks received by the two added operators can be held back with the given delays and the provided delays are non-negative. ## 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, Yarn/Mesos, ZooKeeper: (**no**) ## Documentation - Does this pull request introduce a new feature? (**yes**) - If yes, how is the feature documented? (**JavaDocs**) You can merge this pull request into a Git repository by running: $ git pull https://github.com/xccui/flink FLINK-7245 Alternatively you can review and apply these changes as the patch at: https://github.com/apache/flink/pull/4530.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #4530 ---- commit a24a11522af54c547d014d30adbefa23997d0f8d Author: Xingcan Cui <xingc...@gmail.com> Date: 2017-08-09T12:54:16Z [FLINK-7245] [stream] Support holding back watermarks with static delays commit f730ab45c88f8bcbc27e411901e27dee84aa26b2 Author: Xingcan Cui <xingc...@gmail.com> Date: 2017-08-11T16:15:53Z Refine codes ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. ---