Robert Metzger created FLINK-21883:
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Summary: Introduce cooldown period into adaptive scheduler
Key: FLINK-21883
URL: https://issues.apache.org/jira/browse/FLINK-21883
Project: Flink
Issue Type: Improvement
Components: Runtime / Coordination
Reporter: Robert Metzger
Fix For: 1.14.0
This is a follow up to reactive mode, introduced in FLINK-10407.
Introduce a cooldown timeout, during which no further scaling actions are
performed, after a scaling action.
Without such a cooldown timeout, it can happen with unfortunate timing, that we
are rescaling the job very frequently, because TaskManagers are not all
connecting at the same time.
With the current implementation (1.13), this only applies to scaling up, but
this can also apply to scaling down with autoscaling support.
With this implemented, users can define a cooldown timeout of say 5 minutes: If
taskmanagers are now slowly connecting one after another, we will only rescale
every 5 minutes.
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