Andrey Zagrebin created FLINK-14400:
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Summary: Shrink the scope of MemoryManager from TaskExecutor to
slot
Key: FLINK-14400
URL: https://issues.apache.org/jira/browse/FLINK-14400
Project: Flink
Issue Type: Sub-task
Components: Runtime / Coordination, Runtime / Task
Reporter: Andrey Zagrebin
Assignee: Andrey Zagrebin
MemoryManager currently manages the memory bookkeeping for all slots/tasks
inside one TaskExecutor. For better abstraction and isolation of slots, we can
shrink its scope and make it per slot. The memory limits are fixed now per slot
at the moment of slot creation. All operators, sharing the slot, will get their
fixed fractional limits. In future, we might make it possible for operators to
over-allocate beyond their fraction limit if there is some available free
memory in the slot but it should be possible to reclaim the over-allocated
memory at any time if other operator decides to claim its fair share within its
limit.
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