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      Now after FLINK-14063 , operators will get all manage memory of TaskManager,  The cost of over allocate memory is very high, lead to performance regression of small batch sql jobs:

      • Allocate memory will have the cost of memory management algorithm.
      • Allocate memory will have the cost of memory initialization, will set all memory to zero. And this¬†initialization¬†will require the operating system to actually allocate physical memory.
      • Over allocate memory will squash the file cache too.

      We can optimize the operator algorithm, apply lazy allocation, and avoid meaningless memory allocation.

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              lzljs3620320 Jingsong Lee
              lzljs3620320 Jingsong Lee
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