c620d7c18d
Implements the remaining phases of the six-phase online resharding flow from plan §13.1:
**Phase 3 (Backfill)**:
- backfill_phase(): streams documents from live to shadow index
- Pages through each shard using filter=_miroir_shard={id}
- Re-hashes each document under new shard count
- Writes to shadow with _miroir_origin: reshard_backfill for CDC suppression
- Supports throttling via throttle_docs_per_sec config
- Progress callback support for metrics emission
**Phase 6 (Cleanup)**:
- cleanup_phase(): deletes old index after retention period
- Configurable retention (default 48h) for emergency rollback
- Graceful handling of partial cleanup failures
**Orchestrator**:
- execute_reshard(): sequences all six phases
- Proper error handling and rollback before Phase 5
- Metrics callback for phase transitions (miroir_reshard_phase gauge)
- Returns comprehensive result with stats and verification status
Acceptance criteria addressed:
- Backfill throttles to configured throttle_docs_per_sec
- miroir_reshard_phase gauge transitions via metrics callback
- Mid-backfill failure triggers shadow deletion rollback
- Post-swap rollback supported via reverse alias flip (Phase 5)
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| .. | ||
| miroir-core | ||
| miroir-ctl | ||
| miroir-proxy | ||