Ryan19929 opened a new pull request, #58897:
URL: https://github.com/apache/doris/pull/58897
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
## Background
In current Doris, storage medium (SSD/HDD) selection lacks fine-grained
control:
1. Implicit medium selection with inconsistent fallback behavior
2. Restore operations cannot control whether to preserve or override source
table's storage medium
## Main Changes
**FE:**
- `DataProperty.java`: Add `MediumAllocationMode` enum
- `RestoreCommand.java`: Support new properties
- `RestoreJob.java`: Integrate medium decision logic
- `MediumDecisionMaker.java`: Centralized medium selection (new)
- `SystemInfoService.java`: Support allocation mode in backend selection
- `TableProperty.java`: Persist `medium_allocation_mode`
- `FrontendService.thrift`: Add new RPC fields
**BE:**
- `config.cpp/h`: Add `enable_storage_medium_fallback` for runtime fallback
- `storage_engine.cpp`: Support fallback logic
## Usage Examples
```sql
-- Create with strict mode
CREATE TABLE t1 (...) PROPERTIES (
'storage_medium' = 'ssd',
'medium_allocation_mode' = 'strict'
);
-- Restore preserving source medium
RESTORE SNAPSHOT db1.snap FROM repo PROPERTIES (
'backup_timestamp' = '...',
'storage_medium' = 'same_with_upstream',
'medium_allocation_mode' = 'adaptive'
);
```
### 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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