gc the out-of-date data as fast as possible
Open
- Dominant language
- C++
- Stars
- 1.9k
- Forks
- 432
- PR merge metrics
- No merged PRs in 30d
Description
有这么一个场景：对于某个2G的数据分片（tablet），用户狂删一通（例如行删除），并没有多少真正的gc操作，存在大量垃圾，再去scan时过了大量的垃圾导致用户可见的scan速率非常慢。有效数据只有5%~20%.
Contributor guide
No contributing guide indexed for this repository
Research direction
No source file, entry point, or test is named. Start by tracing tablet scan behavior and garbage-collection handling for delete-heavy data, then establish how stale data should be reclaimed and how scan performance will demonstrate that the issue is resolved.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- databases, performance
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Needs clarification
- Newbie friendliness
- 25/100