Maximilian Michels created FLINK-31502:
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Summary: Limit the number of concurrent scale operations to reduce
cluster churn
Key: FLINK-31502
URL: https://issues.apache.org/jira/browse/FLINK-31502
Project: Flink
Issue Type: Improvement
Components: Autoscaler, Kubernetes Operator
Reporter: Maximilian Michels
Assignee: Maximilian Michels
Fix For: kubernetes-operator-1.5.0
Until we move to using the upcoming Rescale API which recycles pods, we need to
be mindful with how many deployments we scale at the same time because each of
them is going to give up all its pods and require the new number of required
pods.
This can cause churn in the cluster and temporary lead to "unallocatable" pods
which triggers the k8s cluster autoscaler to add more cluster nodes. That is
often not desirable because the actual required resources after the scaling
have been settled, are lower.
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