RisingWave vs Apache Flink: A Detailed Comparison (2026)
RisingWave is a PostgreSQL-compatible streaming database that processes streams with SQL materialized views. Apache Flink is a distributed stream processing engine with Java/Scala APIs and Flink SQL. Choose RisingWave for SQL-native teams wanting built-in serving and simpler operations. Choose Flink for complex event processing (MATCH_RECOGNIZE) and workloads requiring custom Java operators.
Architecture
| Aspect | RisingWave | Apache Flink |
| Written in | Rust | Java |
| Interface | PostgreSQL-compatible SQL | Java/Scala API + Flink SQL |
| State storage | S3 (disaggregated) | RocksDB (local) or ForSt (S3, Flink 2.0) |
| Serving | Built-in (PostgreSQL protocol) | External database required |
| Deployment | Single binary or K8s | Flink cluster (JobManager + TaskManagers) |
| License | Apache 2.0 | Apache 2.0 |
Performance
RisingWave outperforms Flink in 22 out of 27 Nexmark benchmark queries, with some queries achieving over 2x speedup. RisingWave is particularly strong for multi-stream joins (10+ streams), where Flink often encounters state management issues.
Recovery: RisingWave recovers in seconds (state on S3, 1-second checkpoints). Flink 1.x takes minutes (proportional to state size). Flink 2.0 with ForSt recovers in under 10 seconds.
Feature Comparison
| Feature | RisingWave | Flink |
| SQL dialect | PostgreSQL | Flink SQL (ANSI-like) |
| MATCH_RECOGNIZE (CEP) | ❌ | ✅ |
| DataStream API | ❌ | ✅ |
| Cascading MVs | ✅ | ✅ (limited) |
| Native CDC | ✅ (PG, MySQL) | Via Flink CDC |
| Iceberg sink | ✅ (auto-compaction) | ✅ |
| UDFs | Python, Java, Rust | Java, Python |
| Vector search | ✅ | ❌ |
| Checkpoint interval | 1 second | 30sec - minutes |
| Built-in serving | ✅ | ❌ |
When to Choose
RisingWave: SQL-native teams, CDC pipelines, real-time analytics with serving, simpler operations, PostgreSQL ecosystem integration.
Flink: Complex event processing (MATCH_RECOGNIZE), custom Java operators, existing Flink infrastructure, broadest connector ecosystem.
Frequently Asked Questions
Is RisingWave faster than Flink?
In Nexmark benchmarks, RisingWave outperforms Flink in 22/27 queries. However, Flink offers more flexibility for custom processing logic via the DataStream API. Performance depends on the specific workload.
Can RisingWave replace Flink?
For SQL-expressible workloads (aggregations, joins, windows, CDC), yes. For workloads requiring MATCH_RECOGNIZE, custom operators, or the DataStream API, Flink remains necessary.
Which has better fault tolerance?
Both provide exactly-once semantics. RisingWave's 1-second checkpoint interval and S3 state provide faster recovery with lower data loss. Flink 2.0 with ForSt approaches similar performance.
