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  1. Flink
  2. FLINK-12692 Support disk spilling in HeapKeyedStateBackend
  3. FLINK-13815

Implement the SpaceAllocator

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    Description

      As described in the design doc, we need a SpaceAllocator to allocate space on off-heap/disk to store the spilled key-group data.

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            liyu Yu Li
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