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https://issues.apache.org/jira/browse/FLINK-15959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17323101#comment-17323101
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Flink Jira Bot commented on FLINK-15959:
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This issue is assigned but has not received an update in 7 days so it has been
labeled "stale-assigned". If you are still working on the issue, please give an
update and remove the label. If you are no longer working on the issue, please
unassign so someone else may work on it. In 7 days the issue will be
automatically unassigned.
> Add min number of slots configuration to limit total number of slots
> --------------------------------------------------------------------
>
> Key: FLINK-15959
> URL: https://issues.apache.org/jira/browse/FLINK-15959
> Project: Flink
> Issue Type: Improvement
> Components: Runtime / Coordination
> Affects Versions: 1.11.0
> Reporter: YufeiLiu
> Assignee: Yangze Guo
> Priority: Major
> Labels: stale-assigned
> Fix For: 1.13.0
>
>
> Flink removed `-n` option after FLIP-6, change to ResourceManager start a new
> worker when required. But I think maintain a certain amount of slots is
> necessary. These workers will start immediately when ResourceManager starts
> and would not release even if all slots are free.
> Here are some resons:
> # Users actually know how many resources are needed when run a single job,
> initialize all workers when cluster starts can speed up startup process.
> # Job schedule in topology order, next operator won't schedule until prior
> execution slot allocated. The TaskExecutors will start in several batchs in
> some cases, it might slow down the startup speed.
> # Flink support
> [FLINK-12122|https://issues.apache.org/jira/browse/FLINK-12122] [Spread out
> tasks evenly across all available registered TaskManagers], but it will only
> effect if all TMs are registered. Start all TMs at begining can slove this
> problem.
> *suggestion:*
> * Add config "taskmanager.minimum.numberOfTotalSlots" and
> "taskmanager.maximum.numberOfTotalSlots", default behavior is still like
> before.
> * Start plenty number of workers to satisfy minimum slots when
> ResourceManager accept leadership(subtract recovered workers).
> * Don't comlete slot request until minimum number of slots are registered,
> and throw exeception when exceed maximum.
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