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KahaDB vs RocksDB

KahaDB: Apache ActiveMQ Classic's built-in journal-plus-B-tree message store; a persistence engine, not a general DB. RocksDB: Meta's embeddable LSM-tree key-value engine, the storage layer under dozens of databases.

key differences

  • RocksDB is built for larger datasets (≤ 10 TB) than KahaDB (≤ 100 GB).
  • Transactions: KahaDB offers limited ACID; RocksDB offers full.
  • Only RocksDB has ttl / expiry, compression.

choose kahadb for

  • +Durable message persistence for ActiveMQ Classic brokers
  • +Example of a journal plus B-tree index storage design

best at · Queue, Embedded

choose rocksdb for

  • +Storage engine for a custom database or service
  • +Stream-processing state stores (Kafka Streams, Flink)
  • +MySQL storage engine via MyRocks
  • +Write-heavy local indexes and caches on SSD

best at · Embedded, OLTP, Streaming

KahaDBApache ActiveMQ Classic's built-in journal-plus-B-tree message store; a persistence engine, not a general DB.
RocksDBMeta's embeddable LSM-tree key-value engine, the storage layer under dozens of databases.
overview
Primary model
Key-Value
Key-Value
Also supports
Event Store
–
Type
Embedded library
Embedded library
Status
Active
Active
Developer
Apache Software Foundation (ActiveMQ project)
Meta
First release
2009
2013
Latest version
6.3.2 (ActiveMQ Classic) (Sep 2026)
11.12 (Oct 26, 2026)
License
Open source (permissive)Apache License 2.0
Open source (permissive)Apache License 2.0 or GPL-2.0 (dual)
Free tier
✓
✓
popularity
WhichDB Score
0.0
48.2
Rank
#762
#30
GitHub stars
–
32.2K
Stack Overflow questions
–
504
scale & guarantees
Comfortable data size
Small (≤ 100 GB)
Medium (≤ 10 TB)
Horizontal scaling
None
None
Multi-region
None
None
ACID
Limited
Full
Consistency
Strong
Strong
Schema
Schemaless
Schemaless
Architecture
Embedded
Embedded
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
—
Serverless
—
—
Embedded
✓
✓
Edge
—
—
Clouds
–
–
capabilities
Transactions
✓
✓
Joins
—
—
Secondary indexes
—
—
Full-text search
—
—
Vector search
—
—
Geospatial
—
—
JSON
—
—
Change data capture
—
—
Triggers
—
—
Stored procedures
—
—
Materialized views
—
—
TTL / expiry
—
✓
Pub/Sub
—
—
Columnar storage
—
—
In-memory
—
—
Durable persistence
✓
✓
Compression
—
✓
Encryption at rest
—
—
Role-based access
—
—
Time travel
—
—
Branching
—
—
Online schema changes
—
—
Streaming ingest
—
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
None (internal broker API)
C++ API
Client languages
Java
C++, C, Java
Best for
Queue, Embedded
Embedded, OLTP, Streaming, Metadata
Add more to this comparisonNot sure either fits? Try smart match

KahaDB vs RocksDB: FAQ

What is the difference between KahaDB and RocksDB?

KahaDB: Apache ActiveMQ Classic's built-in journal-plus-B-tree message store; a persistence engine, not a general DB. RocksDB: Meta's embeddable LSM-tree key-value engine, the storage layer under dozens of databases. RocksDB is built for larger datasets (≤ 10 TB) than KahaDB (≤ 100 GB). Transactions: KahaDB offers limited ACID; RocksDB offers full. Only RocksDB has ttl / expiry, compression.

When should I choose KahaDB over RocksDB?

Choose KahaDB for durable message persistence for ActiveMQ Classic brokers and example of a journal plus B-tree index storage design. Choose RocksDB for storage engine for a custom database or service; stream-processing state stores (Kafka Streams, Flink); and MySQL storage engine via MyRocks.

Is KahaDB or RocksDB more popular?

RocksDB ranks #30 on the WhichDB Score (48.2/100) and KahaDB ranks #762 (0.0/100). Popularity is not fit: check the requirements that matter for your project.

Are KahaDB and RocksDB open source?

Yes. KahaDB is open source. License: Apache License 2.0. Yes. RocksDB is open source. License: Apache License 2.0 or GPL-2.0 (dual).