uchenily opened a new pull request, #67242:
URL: https://github.com/apache/doris/pull/67242
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
The flush token back pressure in the load stream was implemented with a
busy-wait loop that polls the number of queued flush tasks and sleeps a few
milliseconds repeatedly until a slot frees up or the timeout elapses. This
wastes CPU cycles and reacts slowly when a slot becomes available.
This PR replaces the polling loop with a condition variable based
back-pressure: the sender blocks until a flush slot is available (or the
timeout is hit), and the slot is released via a deferred cleanup on task
completion, which wakes one waiting sender. This removes the spinning and
reacts promptly to freed slots.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] Unit Test
- [x] Manual test (add detailed scripts or steps below)
- [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
- [ ] Previous test can cover this change.
- [ ] No code files have been changed.
- [ ] Other reason <!-- Add your reason? -->
- Behavior changed:
- [ ] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR should
merge into -->
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