I am running a 3-node external cluster, but I find that the memory is growing slowly. By checking the top, I can see that the buffer/cache has been growing slowly and has not been released. What is the reason for this
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Description

Contributor guide
Research direction
No source files, tests, or entry points are identified in the issue. Start by reviewing the attached screenshot and reproducing the reported memory and buffer/cache growth in the three-node external cluster; done means identifying and documenting the reason the memory is not released.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- java
- Domain
- databases, distributed-systems
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 20/100