TangSiyang2001 opened a new pull request, #57271:
URL: https://github.com/apache/doris/pull/57271
Related PR: #52440
In read-write splitting scenarios, some BE (Backend) nodes may have already
merged certain rowset versions, while another BE still attempts to capture or
access those rowsets.
When this happens, the BE reports error E-230 (versions already merged),
causing data access or synchronization to fail.
This PR introduces a remote rowset fetching mechanism, allowing a BE that
lacks the required rowset to fetch it from other BE nodes, instead of failing
with E-230.
- Added a remote fetch mechanism in the rowset management layer: When a BE
detects that a rowset is missing locally but has already been merged, it will
try to fetch the rowset from other BE nodes.
- Updated version and state checking logic to correctly identify the “merged
but missing” condition.
- Adjusted the rowset access path to trigger remote fetch rather than
throwing an immediate error.
- Added tests (unit/integration) to cover the new logic where applicable.
- Ensured backward compatibility: If the BE already has the rowset locally
or read-write splitting is not enabled, the behavior remains unchanged.
Introduce a remote rowset fetching mechanism to prevent E-230 (“versions
already merged”) errors in read-write splitting scenarios. This improves BE
fault tolerance when some nodes have merged versions that others have not yet
synchronized.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] 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)
- [ ] 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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