[jira] [Commented] (FLINK-39554) Support multiple custom autoscaler evaluators with deterministic ordering

["Pavel Zeger (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/FLINK-39554?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18077697#comment-18077697 ] 

Pavel Zeger commented on FLINK-39554:
-------------------------------------

I would like to pick up this improvement

> Support multiple custom autoscaler evaluators with deterministic ordering
> -------------------------------------------------------------------------
>
>                 Key: FLINK-39554
>                 URL: https://issues.apache.org/jira/browse/FLINK-39554
>             Project: Flink
>          Issue Type: Improvement
>          Components: Autoscaler, Kubernetes Operator
>    Affects Versions: kubernetes-operator-1.15.0
>            Reporter: Dennis-Mircea Ciupitu
>            Priority: Major
>
> h1. Summary
> Allow more than one {{FlinkAutoscalerEvaluator}} plugin to be active for a single job, and define a deterministic, configurable ordering contract for how their metric overrides are composed.
> h1. Motivation
> FLINK-39511 introduced the {{FlinkAutoscalerEvaluator}} plugin SPI, aligned the configuration shape with reporter-style idiom ({{{}job.autoscaler.metrics.custom-evaluators{}}} + per-instance {{<name>.class}} + {{{}<name>.<parameter>{}}}), and intentionally limited the runtime to a single custom evaluator per job:
>  * {{job.autoscaler.metrics.custom-evaluators}} is parsed as a list.
>  * If more than one entry is configured, the autoscaler logs a warning and silently falls back to the first entry, ignoring the rest.
> This was a deliberate scope cut to keep the initial PR small and to defer the ordering / composition contract to a follow-up.
> h1. Goal
> Lift the "first-wins" cap and make the registered list of evaluators a true ordered chain whose composition behaviour is well-defined, predictable, and aligned with [FLIP-575|https://cwiki.apache.org/confluence/display/FLINK/FLIP-575%3A+Scaling+Executor+Plugin+SPI+for+Flink+Autoscaler] ({{ScalingExecutorPlugin}}) priority semantics for consistency across the autoscaler plugin SPIs.



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