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https://issues.apache.org/jira/browse/FLINK-34143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17808423#comment-17808423
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Zhu Zhu commented on FLINK-34143:
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[~xiasun]Assigned. Feel free to open a PR for it.
> Modify the effective strategy of
> `execution.batch.adaptive.auto-parallelism.default-source-parallelism`
> -------------------------------------------------------------------------------------------------------
>
> Key: FLINK-34143
> URL: https://issues.apache.org/jira/browse/FLINK-34143
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Coordination
> Affects Versions: 1.19.0
> Reporter: xingbe
> Assignee: xingbe
> Priority: Major
>
> Currently, if users do not set the
> `{{{}execution.batch.adaptive.auto-parallelism.default-source-parallelism`{}}}
> configuration option, the AdaptiveBatchScheduler defaults to a parallelism
> of 1 for source vertices. In
> [FLIP-379|https://cwiki.apache.org/confluence/display/FLINK/FLIP-379%3A+Dynamic+source+parallelism+inference+for+batch+jobs#FLIP379:Dynamicsourceparallelisminferenceforbatchjobs-IntroduceDynamicParallelismInferenceinterfaceforSource],
> the value of
> `{{{}execution.batch.adaptive.auto-parallelism.default-source-parallelism`{}}}
> will act as the upper bound for inferring dynamic source parallelism, and
> continuing with the current policy is no longer appropriate.
> We plan to change the effectiveness strategy of
> `{{{}execution.batch.adaptive.auto-parallelism.default-source-parallelism`{}}};
> when the user does not set this config option, we will use the value of
> `{{{}execution.batch.adaptive.auto-parallelism.max-parallelism`{}}} as the
> upper bound for source parallelism inference. If
> {{`execution.batch.adaptive.auto-parallelism.max-parallelism`}} is also not
> configured, the value of `{{{}parallelism.default`{}}} will be used as a
> fallback.
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