[jira] [Created] (FLINK-18656) Start Delay metric is always zero for unaligned checkpoints

[Shang Yuanchun (Jira)]

Piotr Nowojski created FLINK-18656:
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             Summary: Start Delay metric is always zero for unaligned checkpoints
                 Key: FLINK-18656
                 URL: https://issues.apache.org/jira/browse/FLINK-18656
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Metrics, Runtime / Network
    Affects Versions: 1.11.1
            Reporter: Piotr Nowojski
             Fix For: 1.12.0, 1.11.2
         Attachments: Screenshot 2020-07-21 at 09.53.21.png

As visible in the attached screenshot, start delay is 0, despite very high end to end time and very quick async/sync times. This is impossible, as "start delay" should be equal to "end_to_end_time - sync_time - async_time".

The bug is probably in {{CheckpointBarrierUnaligner}} class, which seems to never invoke {{CheckpointBarrierHandler#markCheckpointStart}}.



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