924060929 opened a new pull request, #60974:
URL: https://github.com/apache/doris/pull/60974
When total tablets are much larger than pipeline capacity,
one-tablet-per-instance planning creates excessive BE concurrency pressure in
query-cache workloads.
Trigger partition-based planning when:
total_tablets > parallel_pipeline_task_num * participating_be_num
Before:
instance_num ~= total_tablets
After:
instance_num ~= partitions_on_each_be
Per-BE planning example:
BE1 tablets: p1[t1,t2], p2[t3] -> instances: [p1:t1,t2], [p2:t3]
BE2 tablets: p1[t4], p2[t5,t6] -> instances: [p1:t4], [p2:t5,t6]
This keeps tablets from the same partition in one instance and separates
different partitions into different instances. If partition mapping is
incomplete
or partition planning fails, fallback to default planning for correctness.
Tests:
- partition-based planning path
- fallback-to-default path (incomplete mapping)
- non-query-cache default planning path
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
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- [ ] Regression test
- [ ] Unit Test
- [ ] 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)
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