morningman opened a new pull request, #13793:
URL: https://github.com/apache/doris/pull/13793
# Proposed changes
Issue Number: close #xxx
## Problem summary
1.
In the previous implementation, the max thread num of olap scanner was set
relatively small, such as 3.
which would slow down some of queries.
In this PR, I changed the max thread num to a quarter of the scaner thread
pool(default is 12),
which is less than the old scan node's max thread num, but larger than the
previous implementation.
The upper limit of the max thread num of the old scan node is too high,
which is not reasonable.
2.
Lower down the number of pre allocated free blocks.
## Checklist(Required)
1. Does it affect the original behavior:
- [ ] Yes
- [ ] No
- [ ] I don't know
2. Has unit tests been added:
- [ ] Yes
- [ ] No
- [ ] No Need
3. Has document been added or modified:
- [ ] Yes
- [ ] No
- [ ] No Need
4. Does it need to update dependencies:
- [ ] Yes
- [ ] No
5. Are there any changes that cannot be rolled back:
- [ ] Yes (If Yes, please explain WHY)
- [ ] No
## Further comments
If this is a relatively large or complex change, kick off the discussion at
[[email protected]](mailto:[email protected]) by explaining why you
chose the solution you did and what alternatives you considered, etc...
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