elassandra
Elassandra merges Apache Cassandra (a distributed NoSQL database) with Elasticsearch (a search engine) into a single system. It enables full-text search, real-time aggregations, and cross-datacenter replication on Cassandra data without needing separate infrastructure.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | strapdata/elassandra |
| Owner | strapdata |
| Primary language | Java |
| License | Apache-2.0 — OSI-approved |
| Stars | 1.7k |
| Forks | 194 |
| Open issues | 60 |
| Latest release | v6.2.3.38 (2022-03-28) |
| Last updated | 2026-05-17 |
| Source | https://github.com/strapdata/elassandra |
What elassandra is
Elassandra embeds Elasticsearch within Cassandra nodes, using Cassandra as the primary data and configuration store while Elasticsearch indexes provide search capabilities. It supports multi-master replication, horizontal scaling via vnodes, and REST/CQL access patterns, eliminating the need for a separate search cluster.
Get the elassandra source
Clone the repository and explore it locally.
git clone https://github.com/strapdata/elassandra.gitcd elassandra# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Cassandra replication factor for elastic_admin keyspace must be managed manually (minimum 3 per datacenter for PAXOS quorum); not auto-adjusted in 6.2.3.21+.
- Rolling upgrades require careful coordination: avoid Elasticsearch mapping changes during upgrades to prevent inconsistency between old and new versions.
- X1 gossip compression (-Des.compress_x1=true) should be enabled post-upgrade to 6.8.4.2+ for large numbers of indices; requires cluster-wide restart.
- CQL schema extensions (v6.2.3.8+) store Elasticsearch mappings in binary format; older cqlsh tools may fail; use bundled cqlsh or pip-installed version.
- Horizontal scaling adds search throughput (unlike standard Elasticsearch which requires shard redistribution); but operational complexity of multi-node Cassandra must be managed.
When to avoid it — and what to weigh
- Elasticsearch-only search use cases — If you only need Elasticsearch and not a persistent, replicated NoSQL store, standard Elasticsearch is simpler and better supported by Elastic.
- Need for latest Elasticsearch versions and rapid feature updates — Latest release is v6.2.3.38 from March 2022. Elasticsearch is now at v8+. Elassandra trails significantly in version and may not include recent security patches or features from Elastic.
- Small-scale, simple search-only projects — Operational complexity of a distributed system is unnecessary if you need basic search on modest data volumes. Standard search engines or managed services are faster to deploy.
- Strict commercial support requirements — Project is community-driven with no clear commercial support organization stated. If you require guaranteed SLAs and vendor backing, assess alternatives.
License & commercial use
Elassandra is licensed under Apache License 2.0, a permissive OSI-approved license allowing commercial use, modification, and distribution with minimal restrictions.
Apache 2.0 permits commercial use without explicit license fees or restrictions. However, no commercial support organization is identified in the provided data. Organizations requiring SLAs, professional support, or guaranteed maintenance should verify support arrangements directly with Strapdata or the community.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Moderate |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | High |
| DEV.co fit | Possible |
| Assessment confidence | Medium |
No explicit security audit, vulnerability disclosure policy, or hardening guidance provided in available data. Apache 2.0 license and Java implementation mean standard Java/Cassandra/Elasticsearch security practices apply. Evaluate: network segmentation, authentication/authorization plugins, encryption at rest/transit, compliance with your threat model. Verify current patch status for embedded Elasticsearch (v6.x) against known CVEs.
Alternatives to consider
Elasticsearch + separate Cassandra
Maintains flexibility to upgrade Elasticsearch independently, use latest versions, and leverage Elastic's commercial support. Adds operational overhead but reduces lock-in and version lag.
OpenSearch (AWS-maintained Elasticsearch fork) + Cassandra
OpenSearch is more actively maintained than Elasticsearch 6.x and includes security plugins out-of-box. Similar dual-system trade-offs as plain Elasticsearch.
Cloud-managed search services (e.g., Elasticsearch Cloud, OpenSearch Serverless)
Eliminates deployment and operational complexity for search; pairs with self-managed Cassandra or cloud Cassandra services if unified storage is not required.
Build on elassandra with DEV.co software developers
Assess your multi-datacenter search and replication requirements. Verify commercial support availability and test version compatibility with your Elasticsearch tooling. Consult a database architect familiar with both Cassandra and Elasticsearch.
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elassandra FAQ
Can I upgrade Elassandra independently of Elasticsearch?
Is Elassandra suitable for production with SLA requirements?
What is the version lag compared to standard Elasticsearch?
Can I run Elassandra in Kubernetes?
Software development & web development with DEV.co
Adopting elassandra is usually one piece of a larger software development effort. As a software development agency, DEV.co provides software development services and web development expertise — pairing senior software developers and web developers with your team to design, build, and operate open-source databases software in production.
Ready to evaluate Elassandra?
Assess your multi-datacenter search and replication requirements. Verify commercial support availability and test version compatibility with your Elasticsearch tooling. Consult a database architect familiar with both Cassandra and Elasticsearch.