azagrebin opened a new pull request #13018:
URL: https://github.com/apache/flink/pull/13018
## What is the purpose of the change
`PhysicalSlotProviderImpl` tries to allocate a physical slot from the
available idle cached slots in `SlotPool`.
If it is not possible, it requests a new slot from the SlotPool.
## Brief change log
- Introduce interface `PhysicalSlotProvider`
- Implement it with the `PhysicalSlotProviderImpl`
## Verifying this change
Unit tests.
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