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

["Piotr Nowojski (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-18656?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Piotr Nowojski closed FLINK-18656.
----------------------------------
    Resolution: Fixed

Merged to master as 5dccc996b3 and to release-1.11 as 59c590587f

> 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: Bug
>          Components: Runtime / Metrics, Runtime / Network
>    Affects Versions: 1.11.1
>            Reporter: Piotr Nowojski
>            Assignee: Piotr Nowojski
>            Priority: Critical
>              Labels: pull-request-available
>             Fix For: 1.12.0, 1.11.2
>
>         Attachments: Screenshot 2020-07-21 at 09.53.21.png, Screenshot 2020-07-21 at 09.58.29.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}}.
> *It's important to make sure this metric is also set for source tasks* (time to acquire checkpoint lock).



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