cambyzju opened a new pull request, #66812:
URL: https://github.com/apache/doris/pull/66812
### What problem does this PR solve?
## Problem
Two race conditions exist in dictionary version lifecycle between FE and
BE:
**1. FE version ahead of BE commit (N+1 vs N)**
FE `dataLoad()` calls `increaseVersion()` before sending
`commitNowVersion()` RPC to BE .
During this window, queries with `dict_get(version_id=N+1)` fail on BE with
"dictionary not found".
**2. BE GCs old version while in-flight query still uses it (N+1 vs N)**
BE previously stored only one version per dict. After a new version N+1 is
committed, the old version N is immediately overwritten. In-flight queries
that started with version N (already planned on FE) then fail on BE because
version N no longer exists.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] Regression test
- [x] 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)
- [ ] 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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