debezium/dbz

Standardize `snapshot.fetch.size` default values across connectors [DBZ-3694]

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#481 opened on Dec 11, 2025

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component/db2-connectorcomponent/mongodb-connectorcomponent/mysql-connectorcomponent/oracle-connectorcomponent/postgresql-connectorcomponent/sqlserver-connectorgood first issuemigrated-from-jiratype/task

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Description

Migrated from DBZ-3694

We currently have different default values for {{snapshot.fetch.size}}.

||Connector||Default|| |PostgreSQL|10,240| |Oracle|10,000| |MySQL|Integer.MIN_VALUE| |MariaDB|1| |SQL Server|2,000| |Db2|2,000| |MongoDB|0| |Vitess|N/A?| |Cassandra|N/A?|

Contributor guide

Research direction
Examine each connector's configuration for snapshot.fetch.size and propose a unified default value.
Tech stack
java
Domain
backenddatabase
Issue type
Refactor
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.
Half day
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.
Mostly clear
Prerequisites
JavaGitDebezium basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40