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Canal: Alibaba's MySQL Binlog Incremental Subscription & Consumption Component
Canal is an open-source project from Alibaba designed to facilitate real-time data synchronization and change data capture (CDC) by subscribing to MySQL binlog.
Java
Added on 2025年6月19日29,155
Stars7,664
ForksJava
LanguageProject Introduction
Summary
Canal captures incremental data changes from MySQL databases by simulating the MySQL replication protocol. It provides a reliable mechanism for applications to consume these changes for downstream processing.
Problem Solved
Provides a robust and non-intrusive method for capturing database changes, avoiding the complexities and performance overhead of polling or database triggers for real-time data needs.
Core Features
Real-time Binlog Capture
Simulates a MySQL slave to parse binlog events in real-time, capturing INSERT, UPDATE, and DELETE operations.
Flexible Output and Integration
Supports multiple data output formats (e.g., JSON, Protobuf) and integration with various message queues (e.g., Kafka, RocketMQ).
Tech Stack
Java
MySQL Binlog Protocol
Apache Kafka
Apache RocketMQ
Spring Framework
Usage Scenarios
Canal is suitable for various applications where real-time or near real-time access to MySQL database changes is required, such as:
Real-time Data Synchronization
Details
Synchronize data changes from a production MySQL database to other data stores like data warehouses (e.g., Hive, ClickHouse), NoSQL databases (e.g., HBase), or other relational databases.
User Value
Ensures downstream systems have near real-time data, enabling fresh analytics, reporting, and consistent data views across the organization.
Cache Invalidation
Details
React to database updates to invalidate or refresh application caches (e.g., Redis, Memcached), ensuring data consistency between the database and the cache layer.
User Value
Reduces stale data in caches, improves application performance by minimizing cache misses on outdated data, and simplifies cache management logic.
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