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debezium-timestamp-override

SMT for Kafka Connect to override event timestamps from Debezium

Motivation

After working with Debezium and Kafka Streams/ksqlDB for a while, joining streams proved difficult for historical data from Debezium into new streams due to the fact that initial snapshots were always using wall-clock time.

Since ksqlDB does not yet support Global KTables and timestamp extraction proved difficult with tombstone events and had to be applied everywhere.

This SMT provides the means, if the underlying database provides created_at and/or updated_at columns, to be able to override the record timestamp at the source, making stream-table joins a lot easier.

Configuration

create.ts.field

The column which determines the creation time and initial snapshot (i.e. read) time.

  • Importance: MEDIUM
  • Type: STRING

update.ts.field

The column which determines the update time.

  • Importance: MEDIUM
  • Type: STRING

fallback.to.commit.time

Whether delete and truncate operations (or other operations where the field is absent) should have their timestamps overridden to the source.ts_ms commit time.

  • Importance: LOW
  • Type: BOOLEAN
  • Default Value: false

Usage example

"transforms": "tsOverride",
"transforms.tsOverride.type": "io.debezium.transforms.TimestampOverride",
"transforms.tsOverride.create.ts.field": "created_at",
"transforms.tsOverride.update.ts.field": "updated_at",
"transforms.tsOverride.fallback.to.commit.time": "true",

Development

Building the source

./gradlew clean build

Contributions

Contributions are welcome! Especially those which can help me package it correctly and upload to Confluent Hub.