Cassandra to SAP HANA
real-time replication
TwinCommit replicates Apache Cassandra to SAP HANA in real time by reading the Cassandra transaction log and applying every committed change exactly once and in commit order. Use it to migrate or continuously mirror Cassandra into SAP HANA with zero downtime, with no triggers or capture tables on the source.
Cassandra
log reader
commit-ordered · exactly-once
SAP HANA
native writer
How capture works on Cassandra
TwinCommit tails the CDC commit-log segments on every node, deduplicates replica writes, and orders mutations by write timestamp per partition.
Prerequisites
- ✓cdc_enabled: true in cassandra.yaml
- ✓WITH cdc = true on replicated tables
- ✓Agent sidecar or shared volume access to cdc_raw on each node
How apply works on SAP HANA
Array UPSERT and DELETE statements committed in the same transaction as the TwinCommit checkpoint.
Requirements
- ✓log_mode = normal
- ✓Technical user with LOG ADMIN and CATALOG READ
- ✓Primary keys on replicated tables
Setup
Set up Cassandra → SAP HANA in four steps
- 1
Prepare Cassandra
Run twincommit check. It verifies cdc_enabled: true in cassandra.yaml and the other prerequisites, and prints the exact fix for anything missing.
- 2
Point at SAP HANA
Add a target block for SAP HANA. TwinCommit can generate target DDL with twincommit ddl -apply.
- 3
Snapshot
twincommit snapshot copies each table under a brief share lock and records the exact log position.
- 4
Stream
twincommit run streams every committed change from that position, exactly once and in commit order.
source:
type: cassandra
contact_points: [cass-1, cass-2, cass-3]
cdc_dir: /var/lib/cassandra/cdc_raw
target:
type: saphana
host: hana.internal:30015
user: ${HANA_USER}
password: ${HANA_PASSWORD}
schema: REPLICA
tables:
- source: sales.orders
- source: sales.customersCassandra to SAP HANA replication FAQ
How does TwinCommit replicate Cassandra to SAP HANA?
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TwinCommit reads changes from the Cassandra transaction log, buffers them per transaction, and applies each committed transaction to SAP HANA in commit order. Array UPSERT and DELETE statements committed in the same transaction as the TwinCommit checkpoint.
Does Cassandra to SAP HANA replication need triggers or capture tables?
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No. TwinCommit reads the Cassandra log directly and creates no objects in the source database.
Is Cassandra to SAP HANA replication exactly-once?
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Yes. TwinCommit commits its checkpoint in the same SAP HANA transaction as the data, so a crash or restart never loses or duplicates a transaction.
What Cassandra versions are supported?
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Apache Cassandra 4.0, 4.1, 5.0 · DataStax Enterprise 6.8+ · Astra DB (target) · ScyllaDB (target).
Stream Cassandra to SAP HANA today.
Download the free Developer edition, or have one of our replication engineers walk you through a migration plan.