[RFC] Prevent OOM caused crashes.

[CPWstatic]

Summary

Analyze memory usage of the current process, and avoid the risk of service crash caused by OOM

Motivation

Avoid service crash

Usage explanation

When the process cannot obtain physical pages from the operating system or the memory usage exceeds the maximum memory usage threshold configured by the user in advance, terminate the current query

Design explanation

1. Get process memory usage
2. Set checkpoint on the critical path
3. Take some measures to avoid OOM or terminate the current query

Drawbacks

Prior art

Unresolved questions