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https://issues.apache.org/jira/browse/FLINK-12765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Stephan Ewen closed FLINK-12765.
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> Bookkeeping of available resources of allocated slots in SlotPool.
> ------------------------------------------------------------------
>
> Key: FLINK-12765
> URL: https://issues.apache.org/jira/browse/FLINK-12765
> Project: Flink
> Issue Type: Sub-task
> Components: Runtime / Coordination
> Affects Versions: 1.8.0, 1.9.0
> Reporter: Xintong Song
> Assignee: Yun Gao
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.9.0
>
> Time Spent: 20m
> Remaining Estimate: 0h
>
> In this version, a task will always requests slot with its own resource need.
> If the resource need is less than the default slot resource, it will always
> be allocated to a default sized slot.
>
> The extra resources in the slot leaves chances for other tasks within the
> same slot sharing group to fit in. To take these chance, SlotPool will
> maintain available resources of each allocated slot. Available resource of an
> allocated slot should always be the total resource of the slot minus
> resources of tasks already assigned onto the slot. In this way, the SlotPool
> would be able to determine whether another task can fit into the slot. If a
> task cannot fit into the slot, for slot sharing group the SlotPool should
> request another slot from the ResourceManager, and for colocation group it
> should fail the job.
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