bobhan1
b2164ff1ba
### What problem does this PR solve?
Issue Number: N/A
Problem Summary:
With background delete bitmap checks enabled, the checker holds the
delete bitmap read lock while `tablet_schema()` acquires the tablet
header lock. Compaction takes these locks in the opposite order, causing
a deadlock on the same tablet. The checker also runs inside
`TabletMap::traverse()`, so its outer map mutex blocks unrelated tablet
initialization, Rowsets scans, synchronization, and compaction
scheduling.
Read the sequence-column flag before traversing the delete bitmap, and
run checks outside the map mutex by reusing the existing tablet
snapshot. Preserve the active/stale rowset version checks for sequence
and non-sequence tables.
### Release note
Fix BE deadlocks and cascading write and metadata stalls when background
delete bitmap checks are enabled.
### Check List (For Author)
- Test
- [ ] Regression test
- [x] Unit Test
- [ ] Manual test
- [ ] No need to test
- Behavior changed:
- [ ] No.
- [x] Yes. Delete bitmap checks avoid the reversed lock order and no
longer hold the tablet map mutex while checking individual tablets.
- Does this need documentation?
- [x] No.
- [ ] Yes.
Validation: 72 ASAN unit tests passed, including five new instances
covering lock ordering, an empty compaction bitmap merge, unrelated
tablet map operations, and sequence/non-sequence version semantics.
`build-support/check-format.sh`, `build-support/check-build-hygiene.sh`,
and `git diff --check` passed.
```bash
./run-be-ut.sh --run --filter='SequenceModes/CloudTabletDeleteBitmapCheckTest.*:CloudTabletMgrTest.*:CloudTabletDeleteBitmapTest.*:PrefillModes/CloudTabletDeleteBitmapPrefillTest.*:TabletMetaTest.*:CloudCompactionTest.*' -j100
```
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label
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Apache Doris is an open-source, real-time analytics and search database built on MPP architecture. It provides fast SQL analytics, lakehouse query acceleration, and hybrid search across structured, text, and vector data.
Explore the official website for the latest product overview, use cases, ecosystem updates, blogs, and user stories. For version updates, see all release notes.
📈 Use Cases
| Use Case | What it provides |
|---|---|
| Customer-Facing Analytics | Ship sub-second interactive analytics to external users. |
| Data Warehousing | Build one real-time warehouse across business domains. |
| Observability | Analyze high-throughput logs, events, and metrics with SQL. |
| Doris for AI | Use vector, text, JSON, and structured search in one SQL engine. |
🚀 Core Capabilities
Apache Doris is built around three core capabilities. The website is the source of truth for detailed product descriptions and examples.
| Capability | What it provides |
|---|---|
| Real-Time Analytics | Streaming ingestion, incremental transformation, and sub-second queries under high concurrency. |
| Lakehouse Analytics | Fast SQL analytics over open table formats such as Iceberg, Delta Lake, and Hudi. |
| Hybrid Search | SQL-native analytics across JSON, full-text, and vector data for AI and search workloads. |
🔌 Ecosystem
Doris sits at the center of the modern data stack. It connects upstream databases, streaming systems, and lakehouse storage with downstream BI, AI, analytics, and observability tools.
For the latest ecosystem coverage, visit the official website and the connection and integration documentation.
👣 Get Started
🧱 Architecture
Apache Doris supports both compute-storage coupled and compute-storage decoupled deployments. In decoupled mode, stateless compute groups run over shared object storage, so you can scale compute on demand and isolate workloads.
Learn more in the deployment guide and deployment mode guide.
📣 Project Updates
| Resource | What it provides |
|---|---|
| Community Report | Weekly updates on community activity, merged PRs, contributors, and feature progress. |
| Roadmap 2026 | The 2026 planning discussion for AI and hybrid search, query engine, storage, and data lake work. |
🧩 Components
Doris provides connectors and tools for common data engineering workflows.
- Doris Flink Connector
- Doris Spark Connector
- Doris Kafka Connector
- Doris Stream Loader
- Doris Kubernetes Operator
👨👩👧👦 Users
Apache Doris is used in production by thousands of companies worldwide across internet services, finance, retail, logistics, manufacturing, energy, telecommunications, AI, and other industries.
🙌 Contributors
Apache Doris graduated from the Apache Incubator and became an Apache Top-Level Project in June 2022. Thanks to all community contributors who help build Doris.
🌈 Community and Support
💬 Contact Us
🧰 Links
- Apache Doris official website: doris.apache.org
- X: @doris_apache
- Medium: @ApacheDoris
📜 License
Note
Some licenses of the third-party dependencies are not compatible with Apache 2.0 License. So you need to disable some Doris features to comply with Apache 2.0 License. For details, refer to the
thirdparty/LICENSE.txt