Jingsong Lee created FLINK-15172:
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Summary: optimize the operator algorithm to lazily allocate memory
Key: FLINK-15172
URL: https://issues.apache.org/jira/browse/FLINK-15172
Project: Flink
Issue Type: Sub-task
Components: Table SQL / Runtime
Reporter: Jingsong Lee
Fix For: 1.11.0
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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