Meet Security & Compliance Standards
Zero
Downtime upgrades
Downtime upgrades
Rolling node-by-node upgrades keep your production database live through every Apache Cassandra 4.x to 5.x cutover.
24/7
Managed support
Managed support
Compaction pressure, tombstone accumulation, and read latency spikes are resolved before they reach your production workloads.
99.99%
Availability goals
Availability goals
Replication factor, repair scheduling, and incremental repair are configured for availability under real failure conditions.
5.x
Upgrade ready
Upgrade ready
Deprecated CQL features scanned, BTI SSTable compatibility confirmed, and storage mode validated before production is touched.
Upgrade Apache Cassandra 4.x to 5.x with Ksolves Experts
Apache Cassandra follows a policy of supporting only its latest three GA releases at any time (currently 4.0, 4.1, and 5.0). Cassandra 4.0 will lose security support the moment the project ships its next release, and every CVE discovered after that point stays unpatched with no guaranteed remediation path.
Ksolves is backed by highly experienced Apache Cassandra upgrade experts who have executed 4.x to 5.x production upgrades of every scale. Fixed price, written data accuracy guarantee, and a confirmed timeline agreed upon before any work begins.
Why Upgrade Apache Cassandra 4.x to 5.x?
Six compounding risks that grow worse every day you stay on
Apache Cassandra 4.x.
Unpatched security vulnerabilities
Once 4.0 falls out of the project's three-supported-release window, every vulnerability discovered afterward stays permanently unpatched with no official remediation path.
Compliance and audit exposure
SOC 2, PCI-DSS, and HIPAA auditors flag end-of-life software. On managed platforms, EOL Cassandra 4.x clusters are no longer eligible for PCI compliance or production SLAs.
Blocked AI and vector search readiness
Cassandra 5.x delivers native ANN vector search and Storage-Attached Indexes for AI workloads. None of these are production-ready in Cassandra 4.x at any patch level.
Driver and connector breakage
Every new driver release your team cannot adopt widens the gap between your application stack and the Cassandra 5.x ecosystem.
Growing operational debt
Every new table written on 4.x adds to the BTI SSTable conversion scope. Starting the storage compatibility mode transition now costs less than executing it under incident pressure.
Shrinking upgrade window
Cassandra 4.x to 5.x requires a three-phase storage compatibility mode transition taking weeks to execute safely. Starting late raises cost and production risk.
Still on Apache Cassandra 4.x?
Upgrade to 5.x Now.
Our certified experts audit your cluster and deliver a written
upgrade plan before any work begins.
Our Apache Cassandra Upgrade Services
Every Ksolves Apache Cassandra upgrade service is scoped upfront, delivered by certified experts, and backed by a verified rollback strategy.
Apache Cassandra 4.x to 5.x Rolling Upgrade
Ksolves runs CQL compatibility assessment, driver version validation, and rolling node upgrade execution with storage_compatibility_mode set to CASSANDRA_4, ensuring your 4.x to 5.x upgrade is delivered without production disruption.
Storage Compatibility Mode Transition
Cassandra 4.x to 5.x requires three controlled phases: CASSANDRA_4 mode, UPGRADING mode for SSTable preparation, then NONE to fully commit to 5.x. Ksolves executes every phase with validated checkpoints and a tested rollback path.
BTI SSTable Format Upgrade
BTI SSTables deliver faster partition lookups through trie-based indexing. Ksolves plans and executes the BIG-to-BTI conversion with compaction behaviour validated at every stage before format commitment.
Storage-Attached Index Migration
SAI is production-ready only in Cassandra 5.x. Ksolves audits your existing secondary index configuration, maps every 2i and SASI index to SAI equivalents, and executes the index rebuild across all keyspaces.
Unified Compaction Strategy Migration
Cassandra 5.x introduces the Unified Compaction Strategy, replacing manual STCS and LCS tuning. Ksolves evaluates your compaction configuration, validates UCS against your workload profile, and monitors stable compaction behaviour post-upgrade.
Self-hosted to Managed Cassandra 5.x Upgrade
Ksolves executes pre-upgrade eligibility checks, validates keyspace configurations, and confirms every table post-restore before decommissioning your self-hosted 4.x source cluster.
Our Apache Cassandra Upgrade Services
Every Ksolves Apache Cassandra upgrade service is scoped upfront, delivered by certified experts, and backed by a verified rollback strategy.
Apache Cassandra 4.x to 5.x Rolling Upgrade
Ksolves runs CQL compatibility assessment, driver version validation, and rolling node upgrade execution with storage_compatibility_mode set to CASSANDRA_4, ensuring your 4.x to 5.x upgrade is delivered without production disruption.
Storage Compatibility Mode Transition
Cassandra 4.x to 5.x requires three controlled phases: CASSANDRA_4 mode, UPGRADING mode for SSTable preparation, then NONE to fully commit to 5.x. Ksolves executes every phase with validated checkpoints and a tested rollback path.
BTI SSTable Format Upgrade
BTI SSTables deliver faster partition lookups through trie-based indexing. Ksolves plans and executes the BIG-to-BTI conversion with compaction behaviour validated at every stage before format commitment.
Storage-Attached Index Migration
SAI is production-ready only in Cassandra 5.x. Ksolves audits your existing secondary index configuration, maps every 2i and SASI index to SAI equivalents, and executes the index rebuild across all keyspaces.
Unified Compaction Strategy Migration
Cassandra 5.x introduces the Unified Compaction Strategy, replacing manual STCS and LCS tuning. Ksolves evaluates your compaction configuration, validates UCS against your workload profile, and monitors stable compaction behaviour post-upgrade.
Self-hosted to Managed Cassandra 5.x Upgrade
Ksolves executes pre-upgrade eligibility checks, validates keyspace configurations, and confirms every table post-restore before decommissioning your self-hosted 4.x source cluster.
Apache Cassandra 4.x vs Apache Cassandra 5.x
A direct comparison of what your 4.x cluster has today against what the
Apache Cassandra upgrade service delivers.
Traditional
Time-limited per release, within the 3-release support window
Accelerator
Continuous, community-maintained
Traditional
Not available
Accelerator
Native ANN vector search via SAI
Traditional
Legacy 2i, limited query types
Accelerator
SAI production-ready, reduced storage overhead
Traditional
BIG format only
Accelerator
BTI trie-based, faster lookups
Traditional
Not available
Accelerator
Native DDM at query time
Traditional
STCS or LCS, manual tuning required
Accelerator
Unified Compaction Strategy, adaptive
Traditional
No compatibility mode required
Accelerator
CASSANDRA_4, UPGRADING, NONE phases
Our Apache Cassandra 4.x to 5.x Upgrade Service Process
From first audit to final handover, every step is planned, executed, and documented by our certified Cassandra upgrade experts.
Environment Audit (Days 1 to 3)
Cluster topology, keyspace inventory, secondary index types, driver versions, and deprecated CQL features flagged. BIG SSTable volume assessed before the upgrade plan is drafted.
Compatibility Analysis (Days 3 to 5)
Every keyspace, table, and index is categorised as action required or no action needed. Written compatibility gap report ranked by severity for your team to approve.
Upgrade Runbook (Days 5 to 7)
Runbook covering node upgrade order, storage compatibility mode sequencing, BTI conversion steps, and rollback triggers prepared and approved before staging begins.
Staging Validation (Days 7 to 14)
Full rolling upgrade to Cassandra 5.x executed against staging. Read latency, write throughput, and compaction behaviour validated against 4.x baselines before production cutover is approved.
Cutover Day – Production Upgrade
Rolling node-by-node upgrade with cluster health confirmed between each replacement. Storage compatibility mode advanced to UPGRADING only after all nodes are stable on 5.x.
Post-Upgrade (48 to 72 Hours)
Cluster health, latency, compaction throughput, and BTI conversion progress are monitored. Engagement closes with a written handover document and recommended next steps.
Our Apache Cassandra 4.x to 5.x Upgrade Service Process
From first audit to final handover, every step is planned, executed, and documented by our certified Cassandra upgrade experts.
Environment Audit (Days 1 to 3)
Cluster topology, keyspace inventory, secondary index types, driver versions, and deprecated CQL features flagged. BIG SSTable volume assessed before the upgrade plan is drafted.
Compatibility Analysis (Days 3 to 5)
Every keyspace, table, and index is categorised as action required or no action needed. Written compatibility gap report ranked by severity for your team to approve.
Upgrade Runbook (Days 5 to 7)
Runbook covering node upgrade order, storage compatibility mode sequencing, BTI conversion steps, and rollback triggers prepared and approved before staging begins.
Staging Validation (Days 7 to 14)
Full rolling upgrade to Cassandra 5.x executed against staging. Read latency, write throughput, and compaction behaviour validated against 4.x baselines before production cutover is approved.
Cutover Day – Production Upgrade
Rolling node-by-node upgrade with cluster health confirmed between each replacement. Storage compatibility mode advanced to UPGRADING only after all nodes are stable on 5.x.
Post-Upgrade (48 to 72 Hours)
Cluster health, latency, compaction throughput, and BTI conversion progress are monitored. Engagement closes with a written handover document and recommended next steps.
Every day on Apache Cassandra 4.x is a day your cluster falls further behind. Upgrade to 5.x and fix that permanently.
Frequently Asked Questions
A Ksolves Apache Cassandra upgrade service covers environment audit, rolling node upgrade execution, storage compatibility mode transition, staging validation, and post-upgrade monitoring. Ksolves handles every stage, so your team does not need to build that expertise in-house.
Roll all nodes to 5.x with storage_compatibility_mode set to CASSANDRA_4, transition to UPGRADING mode once stable, then set storage_compatibility_mode to NONE to fully commit. Ksolves covers every phase in a structured Apache Cassandra upgrade service before production is touched.
The 4.x to 5.x upgrade runs in three phases: CASSANDRA_4 during the rolling upgrade, UPGRADING mode to prepare SSTables for BTI conversion, then NONE to fully commit to Cassandra 5.x. Ksolves executes each phase with validated checkpoints and a rollback path throughout.
Straightforward 4.x to 5.x upgrades take 3 to 5 weeks. Larger environments with SAI index rebuilds or UCS compaction migration take 6 to 8 weeks. Every Ksolves engagement starts with a 5-day audit producing a firm timeline before you commit.
Environment audit, compatibility gap report, upgrade runbook, staging validation, production cutover, and 48 to 72 hours of post-upgrade monitoring. Every Ksolves engagement includes a named team, fixed price, and written data accuracy guarantee agreed before work begins.
Self-hosted Cassandra on Kubernetes or bare metal, Amazon Keyspaces, Astra DB, and Instaclustr managed Cassandra. Driver validation, SAI index rebuild, and BTI SSTable conversion are included in every Ksolves Apache Cassandra upgrade service engagement.
