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https://issues.apache.org/jira/browse/FLINK-15172?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu reassigned FLINK-15172:
-------------------------------
Assignee: Jingsong Lee
> 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
> Assignee: Jingsong Lee
> Priority: Major
> 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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