Yu Yang created FLINK-20829:
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Summary: flink.jm.downtime metric is inaccurate in flink 1.9.1 and
1.11.1
Key: FLINK-20829
URL: https://issues.apache.org/jira/browse/FLINK-20829
Project: Flink
Issue Type: Bug
Components: API / Scala, Runtime / Metrics
Affects Versions: 1.11.1, 1.9.1
Reporter: Yu Yang
Attachments: Screen Shot 2021-01-01 at 2.38.39 PM.png
According to the comments in
[DownTimeGauge.java|https://github.com/apache/flink/blob/master/flink-runtime/src/main/java/org/apache/flink/runtime/executiongraph/metrics/DownTimeGauge.java#L28]:
A gauge that returns (in milliseconds) how long a job has not been not running
any more, in case it is in a failing/recovering situation. Running jobs return
naturally a value of zero.
We noticed that flink runtime reports inaccurate value for flink.jm.downtime
metric. What flink reports was actually the uptime in milliseconds before the
application restarted.
!Screen Shot 2021-01-01 at 2.38.39 PM.png|width=720!
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