Gyula Fora created FLINK-30466:
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Summary: Detect ineffective scaling operations
Key: FLINK-30466
URL: https://issues.apache.org/jira/browse/FLINK-30466
Project: Flink
Issue Type: New Feature
Components: Kubernetes Operator
Reporter: Gyula Fora
Assignee: Matyas Orhidi
Fix For: kubernetes-operator-1.4.0
The autoscaler logic currently does not consider whether a given proposed
parallelism change will achieve the desired processing rate based on historic
metrics.
It might be possible that we are for example trying to scale down to a
parallelism that we have also done in the past which resulted in an immediate
scale up.
This could be avoided by comparing the expected processing rate at a certain
parallelism with past metrics from that parallelism setting. There should be
some flexibility and a limited "memory" but some simple checks could reduce
instable scaling caused by non-linear performance changes.
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