MySQL to S3
real-time replication
TwinCommit replicates MySQL to Amazon S3 in real time by reading the MySQL transaction log and applying every committed change exactly once and in commit order. Use it to land live MySQL data in S3 as open Delta Lake or Iceberg tables, with no triggers or capture tables on the source.
MySQL
log reader
commit-ordered · exactly-once
S3
native writer
How capture works on MySQL
TwinCommit connects as a replica, reads the row-based binary log and tracks position by GTID, so failovers and replica promotions are seamless.
Prerequisites
- ✓binlog_format = ROW and binlog_row_image = FULL
- ✓GTID mode recommended
- ✓REPLICATION SLAVE and REPLICATION CLIENT grants
How apply works on S3
Changes land as Apache Iceberg, Delta Lake or Parquet tables, one atomic commit per micro-batch with the checkpoint in the snapshot metadata. Iceberg tables register in AWS Glue or Amazon S3 Tables automatically.
Requirements
- ✓IAM role with s3:GetObject, PutObject, DeleteObject and ListBucket on the prefix
- ✓Glue catalog permissions for table registration
- ✓Same-region placement recommended
Setup
Set up MySQL → S3 in four steps
- 1
Prepare MySQL
Run twincommit check. It verifies binlog_format = row and binlog_row_image = full and the other prerequisites, and prints the exact fix for anything missing.
- 2
Point at S3
Add a target block for S3. 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: mysql
dsn: ${SOURCE_DSN}
server_id: 4201
target:
type: s3
bucket: acme-lake
path: replica/{schema}/{table}
format: iceberg
catalog: { type: glue, database: replica }
tables:
- source: SALES.ORDERS
- source: SALES.ORDER_LINES
exclude_columns: [INTERNAL_NOTES]MySQL to S3 replication FAQ
How does TwinCommit replicate MySQL to S3?
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TwinCommit reads changes from the MySQL transaction log, buffers them per transaction, and applies each committed transaction to S3 in commit order. Changes land as Apache Iceberg, Delta Lake or Parquet tables, one atomic commit per micro-batch with the checkpoint in the snapshot metadata. Iceberg tables register in AWS Glue or Amazon S3 Tables automatically.
Does MySQL to S3 replication need triggers or capture tables?
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No. TwinCommit reads the MySQL log directly and creates no objects in the source database.
Is MySQL to S3 replication exactly-once?
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Yes. TwinCommit commits its checkpoint in the same S3 transaction as the data, so a crash or restart never loses or duplicates a transaction.
What MySQL versions are supported?
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MySQL 5.7, 8.0, 8.4, 9.x · Amazon RDS & Aurora MySQL · Azure Database for MySQL · Cloud SQL.
Stream MySQL to S3 today.
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