buptljy commented on issue #11104: [FLINK-16051] Subtask ID in Overview-Subtasks should start from 1 URL: https://github.com/apache/flink/pull/11104#issuecomment-586890133 > Why did you opt for incrementing this subtask id? Now both the checkpoint and subtask id are inconsistent with the entire Flink runtime, including logging and metrics. @zentol I've struggled for a little bit here because: 1. ID in subtasks starts from 0, while ID in checkpoint / watermark / backpressure starts from 1. 2. Logging with #ExecutionVertex#subtaskIndex starts from 0, while Logging with #ExecutionVertex#taskNameWithSubtask starts from 1. The reason I choose incrementing ID in subtasks is that it may look more reasonable and intuitive from user's perspective(maybe not from developer's perspective). I didn't think of the metrics before but it should be included.
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