debezium/dbz

Use snapshot.isolation.mode for incremental snapshotting [DBZ-3653]

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#475 opened on Dec 11, 2025

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component/core-librarygood first issuemigrated-from-jiratype/enhancement

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Description

Migrated from DBZ-3653

Currently the new incremental snapshotting feature uses the default connection isolation level and ignores the snapshot.isolation.mode parameter

It would be nice if it either used the existing snapshot.isolation.mode parameter or had it's own like _incremental._snapshot.isolation.mode, similar to incremental.snapshot.chunk.size

Contributor guide

Research direction
Investigate how snapshot.isolation.mode is currently applied in the codebase and modify the incremental snapshotting logic to use this parameter instead of the default connection isolation level, or alternatively add a new configuration parameter incremental.snapshot.isolation.mode similar to incremental.snapshot.chunk.size.
Tech stack
None
Domain
backenddatabase
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
2
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
GitUnderstanding of Debezium incremental snapshotting
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70