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canal/README.md
rewerma d899981354 修复测试类报错 (#4516) 
* optimize YAML config loader (#4332)

* fix bug BASE TABLE as table name (#4217)

* fix issues#4328 (#4329)

* docs: add nodejs canal client support (#4260)

Co-authored-by: zhangxunwei <zhangxunwei@dxy.cn>

* fix destination not encoded (#4279)

* 修复Canal指定时间戳启动失效，总是从最新的点位开始同步问题 (#4348)

* 支持用户自定义的CanalAlarmHandler

* RowsLogEvent增加对TableMapLogEvent判空检查，防止NPE异常

* 修复Canal指定时间戳启动失效，总是从最新的点位开始同步问题, issue: #4347

Co-authored-by: 云时 <mingya.wmy@alibaba-inc.com>

* fixed 4334 , support jdk8/jdk11

* fixed issue #4266 , typo

* fixed issue #4243 , support auto register for cluster = null

* fixed issue #4225 , support mysql version >= 8.0.26 heartbeat v2

* fixed issue #4308 , support query_log_event for maraiadb 10.10.1

* ignore compression event

* support jdk11

* support druid 1.2.12

* fixed mariadb 10.x

* sync canal-template.properties

* update fastjson & druid version (#4406)

* 修复升级2.0.4导致兼容的问题

* update druid & fastjson version

* update fastjson version

* update druid & fastjson version

* meta.dat文件数据丢失 (#4397)

* update fastjson & druid version (#4438)

* 局部变量线程安全，优先使用StringBuilder替换StringBuffer (#4472)

Co-authored-by: 夏亮 <xialiang@newerabc.com>

* 1. CanalController stop 需要同时将 embededCanalServer.stop (#4477)

2. ServerRunningMonitor 线程池未正常回收，线程池管理与 start/stop保持一致

* vuln-fix: Use HTTPS instead of HTTP to resolve dependencies (#4437)

This fixes a security vulnerability in this project where the `build.gradle`
files were configuring Gradle to resolve dependencies over HTTP instead of
HTTPS.

Weakness: CWE-829: Inclusion of Functionality from Untrusted Control Sphere
Severity: High
CVSSS: 8.1
Detection: OpenRewrite

Reported-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>
Signed-off-by: Jonathan Leitschuh <Jonathan.Leitschuh@gmail.com>

Bug-tracker: https://github.com/JLLeitschuh/security-research/issues/9


Co-authored-by: Moderne <team@moderne.io>

Co-authored-by: Moderne <team@moderne.io>

* fix_ETL同步mysql关键字报错 (#4346)

Co-authored-by: foleyang <foleyang@cogobuy.com>

* optimize code

* use compact BigDecimal

* performance optimize , 1. cache string names 2. cache Charset

* performance optimize ,cache integer/long valueof

* 测试类报错

Co-authored-by: gongchangyou <gongchangyou@gmail.com>
Co-authored-by: ChanaLii <316529035@qq.com>
Co-authored-by: zhangxunwei <zhangxunweia@gmail.com>
Co-authored-by: zhangxunwei <zhangxunwei@dxy.cn>
Co-authored-by: tianpeidong <39491687+tianpeidong@users.noreply.github.com>
Co-authored-by: dataccs <dataccs@163.com>
Co-authored-by: 云时 <mingya.wmy@alibaba-inc.com>
Co-authored-by: jianghang.loujh <jianghang.loujh@alibaba-inc.com>
Co-authored-by: 温绍锦 <shaojin.wensj@alibaba-inc.com>
Co-authored-by: noaso <noasoso@gmail.com>
Co-authored-by: HumanPassenger <40585855+HumanPassenger@users.noreply.github.com>
Co-authored-by: 夏亮 <xialiang@newerabc.com>
Co-authored-by: 华仔 <591327356@qq.com>
Co-authored-by: Jonathan Leitschuh <jonathan.leitschuh@gmail.com>
Co-authored-by: Moderne <team@moderne.io>
Co-authored-by: 杰锅不是锅 <1105568074@qq.com>
Co-authored-by: foleyang <foleyang@cogobuy.com>
2022-12-06 16:17:01 +08:00

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简介

canal [kə'næl]，译意为水道/管道/沟渠，主要用途是基于 MySQL 数据库增量日志解析，提供增量数据订阅和消费

早期阿里巴巴因为杭州和美国双机房部署，存在跨机房同步的业务需求，实现方式主要是基于业务 trigger 获取增量变更。从 2010 年开始，业务逐步尝试数据库日志解析获取增量变更进行同步，由此衍生出了大量的数据库增量订阅和消费业务。

基于日志增量订阅和消费的业务包括

  • 数据库镜像
  • 数据库实时备份
  • 索引构建和实时维护(拆分异构索引、倒排索引等)
  • 业务 cache 刷新
  • 带业务逻辑的增量数据处理

当前的 canal 支持源端 MySQL 版本包括 5.1.x , 5.5.x , 5.6.x , 5.7.x , 8.0.x

工作原理

MySQL主备复制原理

  • MySQL master 将数据变更写入二进制日志( binary log, 其中记录叫做二进制日志事件binary log events，可以通过 show binlog events 进行查看)
  • MySQL slave 将 master 的 binary log events 拷贝到它的中继日志(relay log)
  • MySQL slave 重放 relay log 中事件，将数据变更反映它自己的数据

canal 工作原理

  • canal 模拟 MySQL slave 的交互协议，伪装自己为 MySQL slave ，向 MySQL master 发送dump 协议
  • MySQL master 收到 dump 请求，开始推送 binary log 给 slave (即 canal )
  • canal 解析 binary log 对象(原始为 byte 流)

重要版本更新说明

  1. canal 1.1.x 版本（release_note）,性能与功能层面有较大的突破,重要提升包括:
  1. canal 1.1.4版本，迎来最重要的WebUI能力，引入canal-admin工程，支持面向WebUI的canal动态管理能力，支持配置、任务、日志等在线白屏运维能力，具体文档：Canal Admin Guide

文档

多语言

canal 特别设计了 client-server 模式，交互协议使用 protobuf 3.0 , client 端可采用不同语言实现不同的消费逻辑，欢迎大家提交 pull request

canal 作为 MySQL binlog 增量获取和解析工具，可将变更记录投递到 MQ 系统中，比如 Kafka/RocketMQ，可以借助于 MQ 的多语言能力

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