zhijiangW opened a new pull request #11019: [FLINK-15914][checkpointing][metrics] Miss the barrier alignment metric for the case of two inputs URL: https://github.com/apache/flink/pull/11019 ## What is the purpose of the change When the `StreamTwoInputSelectableProcessor` was introduced before, it was missing to add the barrier alignment metric in the constructor. But it does not cause problems then, because only `StreamTwoInputProcessor` works at that time. After `StreamTwoInputProcessor` is replaced by `StreamTwoInputSelectableProcessor` as now, this bug is exposed and we will not see the barrier alignment metric for the case of two inputs. The solution is to add this metric while constructing the `CheckpointBarrierHandler`. ## Brief change log - *Add the metric of barrier alignment while constructing the `CheckpointBarrierHandler`* ## Verifying this change Via the job testing. ## Does this pull request potentially affect one of the following parts: - Dependencies (does it add or upgrade a dependency): (yes / **no**) - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: (yes / **no**) - The serializers: (yes / **no** / don't know) - The runtime per-record code paths (performance sensitive): (yes / **no** / don't know) - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Yarn/Mesos, ZooKeeper: (yes / **no** / don't know) - The S3 file system connector: (yes / **no** / don't know) ## Documentation - Does this pull request introduce a new feature? (yes / **no**) - If yes, how is the feature documented? (**not applicable** / docs / JavaDocs / not documented)
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