$ show alibaba/canal
This is Alibaba Canal, a mature, production-grade MySQL binlog change data capture (CDC) system. It simulates a MySQL slave to receive binlog dumps, parses all binlog event types (DDL, DML, GTID, etc.), and delivers the change data to downstream consumers via TCP, Kafka, RocketMQ, RabbitMQ, or Pulsar. It also includes a set of pluggable adapters (via SPI) that can synchronize changes directly to relational databases (RDB), Elasticsearch (6.x/7.x/8.x), HBase, Kudu, Phoenix, ClickHouse, Tablestore, or a simple logger. The system provides high availability through ZooKeeper-based leader election, a web-based admin console (Vue.js + Spring Boot), and Prometheus metrics for monitoring. The architecture is modular with clear separation of concerns: parsing, event sink/ordering, buffered store, metadata management, MQ connectors, and adapter plugins. While the codebase shows its age in places (Netty 3.x usage, some deprecated APIs, duplicated adapter logic across ES versions), it remains a robust and heavily used infrastructure component in many production deployments.
The LLM identified 2 files worth highlighting for reuse:
Implements a table/column filter using Aviator expressions. The key innovation is its smart pattern splitting logic that correctly handles regex quantifiers like `{1,2}` or `+` at the end of patterns, which standard String.split() would break. This file is self-contained, depends only on Aviator and standard Java, and could be extracted as a generic regex filter with support for comma-separated patterns and quantifier-safe splitting. Demonstrates non-obvious attention to edge cases in regex parsing.
Implements MySQL's authentication password scrambling algorithms: the classic `scramble411` (for mysql_native_password) and `scrambleCachingSha2` plus RSA encryption (for caching_sha2_password). This is a self-contained utility that only uses standard Java cryptography and math libraries. It can be reused in any Java MySQL client or test tool to authenticate programmatically. The implementation is correct and handles the full specification, including the RSA public key encryption fallback for caching_sha2. A clean, isolated piece of protocol logic.