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  1. Flink
  2. FLINK-12692 Support disk spilling in HeapKeyedStateBackend
  3. FLINK-12696

Implement a MmapManager

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      Since we plan to use mmap to accelerate the state read/write against the spilled (on-disk) KeyGroup, we need a MmapManager to manage the mmap-ed files, pretty much like the MemoryMappedFileManager in log4j2.

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          Sub-task - The sub-task of the issue FLINK-12697 Support on-disk state storage for spill-able heap backend

          • Major - Major loss of function.
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              liyu Yu Li
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