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Open-Source Experts
Apache Cassandra Services
Reviewed & updated:
Apache Cassandra is a wide-column NoSQL database built for write-heavy, high-availability workloads spread across multiple datacenters — the same shape of problem PostgreSQL or MySQL clustering was never really designed to solve. Cassandra 5.0 (the current major release, at 5.0.9) is a genuinely substantial update: a native VECTOR data type with Storage-Attached Indexes (SAI) for similarity search, Trie-based memtables and SSTables for lower memory and storage overhead, a Unified Compaction Strategy that replaces the old size-tiered/leveled choice with one configurable strategy, and dynamic data masking for obfuscating sensitive columns at query time. Cassandra's own data model is the thing most migrations get wrong before they get anything else wrong: it is not "MySQL but distributed" — partition key design decides how data spreads across the cluster and how many nodes a query has to hit, and a table modeled around convenient SQL joins instead of actual query patterns will produce hot partitions and timeouts under real load. ROSTAN's migration work starts with query-pattern-first data modeling, not a mechanical schema port, whether the source is a relational database or an older Cassandra major version (3.x or 4.x) that needs the same discipline applied before upgrading. Ongoing managed operations cover what Cassandra needs that most databases don't: repair scheduling (anti-entropy repair is not optional the way a backup job feels optional), compaction strategy tuning per table rather than cluster-wide defaults, multi-datacenter replication factor and consistency-level review, and node/rack/datacenter-aware topology so a single rack failure doesn't take a replication factor down with it.
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What We Offer
Apache Cassandra
Comprehensive services tailored to your business goals — delivered by certified experts with a proven track record across 20+ countries.
Migration & Data Modeling
Query-pattern-first partition key and table design — from a relational source or an older Cassandra 3.x/4.x cluster — rather than a mechanical schema port.
Multi-DC Cluster Operations
Replication factor, consistency-level and rack/datacenter-aware topology review so node and rack failures don't compromise your actual availability guarantees.
Performance & Compaction Tuning
Anti-entropy repair scheduling and per-table compaction strategy tuning (including Cassandra 5.0's Unified Compaction Strategy) — not cluster-wide defaults left on auto.
11+
Years of Experience
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Certified Consultants
800+
Projects Delivered
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Countries Served
Why Choose Us
Why ROSTAN Technologies?
Certified expertise, proven delivery methodology, and a genuine commitment to your business outcomes — across every technology and every engagement.
Open-Source Native
Our engineers live and breathe Linux, Docker, Kubernetes, PostgreSQL, and the full open-source stack. No vendor lock-in.
Performance by Design
Every application and service we build is benchmarked and optimised. Scalability and speed are non-negotiable requirements.
Security First
OWASP-hardened code, automated security scanning, and dependency management keep every open-source deployment safe.
CI/CD & DevOps Ready
Every project ships with a production-grade CI/CD pipeline, automated testing, and infrastructure-as-code from day one.
FAQ
Frequently Asked
Frequently Asked
Questions
What is new in Apache Cassandra 5.0?
A native VECTOR data type with Storage-Attached Indexes (SAI) for similarity search, Trie-based memtables and SSTables for lower memory/storage overhead, a Unified Compaction Strategy replacing the old size-tiered/leveled choice, and dynamic data masking for obfuscating sensitive columns at query time. Cassandra 5.0.9 is the current GA release.
Why do Cassandra migrations from a relational database go wrong?
Because Cassandra isn't "MySQL but distributed" — partition key design decides how data spreads across the cluster and how many nodes a query has to hit. A table modeled around convenient SQL joins instead of actual query patterns produces hot partitions and timeouts under real load. We model tables around query patterns first, not a mechanical schema port.
Do you migrate from older Cassandra versions (3.x, 4.x) as well as from relational databases?
Yes — an upgrade from Cassandra 3.x or 4.x needs the same data-modeling discipline applied as a fresh migration, particularly if you want to take advantage of 5.0 features like SAI or the Unified Compaction Strategy.
What does "repair" mean in Cassandra operations, and why does it matter?
Anti-entropy repair reconciles data differences between replicas that can build up from dropped writes or node downtime — it is not optional the way a backup job can feel optional. Unrepaired clusters silently accumulate inconsistency. We schedule and monitor repair as a standing operational task, not a one-off.
How do you handle multi-datacenter replication for Cassandra?
We review replication factor and consistency-level settings per keyspace against your actual availability requirements, and design node/rack/datacenter-aware topology so a single rack or datacenter failure doesn't compromise the replication factor you think you have.
Asked Questions
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