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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