doris-debug-import
Use for Doris Stream/Broker/Routine Load issues and Group Commit async_mode WAL pile-up. Tunables: table group_commit_interval_ms / group_commit_data_bytes; BE group_commit_insert_threads, group_commit_wal_path, group_commit_wal_max_disk_limit.
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- apache/doris-skills
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- 2026年7月24日 23:41
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SKILL.md
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- doris-debug-import
- description
- Use for Doris Stream/Broker/Routine Load issues and Group Commit async_mode WAL pile-up. Tunables: table group_commit_interval_ms / group_commit_data_bytes; BE group_commit_insert_threads, group_commit_wal_path, group_commit_wal_max_disk_limit.
- version
- 0.1.0
- category
- import
# Import / Group Commit
## async_mode WAL semantics
Write WAL → RPC returns → background group commit → **delete_wal** on success
(`group_commit_mgr.cpp`). Drain rate = commit finish rate ≠ compaction GB/s.
## Knobs (config.cpp)
| Config | Default | Role |
|--------|---------|------|
| `group_commit_insert_threads` | 10 | commit worker pool |
| `group_commit_relay_wal_threads` | 10 | WAL replay |
| `group_commit_wal_path` | under storage_root | WAL disks |
| `group_commit_wal_max_disk_limit` | 10% | WAL quota |
| table `group_commit_data_bytes` | often 64MB | size flush |
| table `group_commit_interval_ms` | often 10000 | time flush |
## High MB/s guidance
1. Split load across BEs (WAL is local to coordinator BE).
2. `wal-du` on each BE storage path.
3. Prefer dedicated NVMe for `group_commit_wal_path`.
4. A/B `group_commit_data_bytes` (128MB vs 512MB) — size threshold dominates when ingest ≫ interval.
5. `sync_mode` or client throttle for backpressure.
```bash
./scripts/doris-debug wal-du /path/to/be/storage
./scripts/doris-debug log-grep be/log --pack group_commit
```
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