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Posted to dev@flink.apache.org by "Piotr Nowojski (Jira)" <ji...@apache.org> on 2021/12/22 09:00:00 UTC

[jira] [Created] (FLINK-25414) Provide metrics to measure how long task has been blocked

Piotr Nowojski created FLINK-25414:
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             Summary: Provide metrics to measure how long task has been blocked
                 Key: FLINK-25414
                 URL: https://issues.apache.org/jira/browse/FLINK-25414
             Project: Flink
          Issue Type: New Feature
          Components: Runtime / Metrics, Runtime / Task
    Affects Versions: 1.14.2
            Reporter: Piotr Nowojski


Currently back pressured/busy metrics tell the user whether task is blocked/busy and how much % of the time it is blocked/busy. But they do not tell how for how long single block event is lasting. It can be 1ms or 1h and back pressure/busy would be still reporting 100%.

In order to improve this, we could provide two new metrics:
# maxSoftBackPressureDuration
# maxHardBackPressureDuration

The max would be reset to 0 periodically or on every access to the metric (via metric reporter). Soft back pressure would be if task is back pressured in a non blocking fashion (StreamTask detected in availability of the output). Hard back pressure would measure the time task is actually blocked.

Unfortunately I don't know how to efficiently provide similar metric for busy time, without impacting max throughput.



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