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https://issues.apache.org/jira/browse/FLINK-15603?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17016484#comment-17016484
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Congxian Qiu(klion26) commented on FLINK-15603:
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And we may add some debug log in {{CheckpointBarrierAligner}} when received a
barrier and when barrier align complete such as {{CheckpointBarrierTracker}},
this can be helpful when debugging checkpoint problem.
> Show "barrier lag" in checkpoint statistics
> -------------------------------------------
>
> Key: FLINK-15603
> URL: https://issues.apache.org/jira/browse/FLINK-15603
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Web Frontend
> Reporter: Stephan Ewen
> Priority: Critical
> Labels: usability
> Fix For: 1.11.0
>
>
> One of the most important metrics is missing in the checkpoint stats:
> "barrier lag", meaning the time it between when the checkpoint was triggered
> and when the barriers arrive at a task.
> That time is critical to identify if a checkpoint takes too long because of
> backpressure or other contention.
> You can implicitly calculate this by "end_to_end_time - sync_time -
> async_time", but it is much more obvious for users that something is up when
> this number is explicitly shown.
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