Flink源码分析--(一)异步I/O访问外部数据:AsyncWaitOperator

本文深入探讨Flink流计算中异步I/O的实现,通过AsyncWaitOperator提升数据库访问并发度和系统性能。介绍如何创建AsyncWaitOperator,包括自定义UserAsyncFunction和调用AsyncDataStream的API。同时,分析了有序队列与无序队列在Flink异步I/O中的应用。

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一、异步I/O概述

Flink流计算系统中经常需要与外部系统进行交互,比如需要查询外部数据库以关联上用户的额外信息。通常,我们的实现方式是向数据库发送用户a的查询请求(例如在MapFunction中,同步方式访问),然后等待结果返回,在这之前,我们无法发送用户b的查询请求

Flink Async I/O允许用户在数据流中使用支持异步访问的客户端(如果数据库没有可以自行封装,例如自己实现一个Runnable,run()方法最后调用#asyncInvoke()提供的resultFuture返回结果),AsyncWaitOperator会处理与数据流的交互,同时在处理顺序、事件时间、容错有相应的实现,能够提升访问数据库的并发度和流计算系统并行处理性能

本文主要介绍异步I/O在Flink源码层的实现,关于异步I/O应用层原理,推荐阅读Flink(1.9.0)官方文档,里面介绍得比较详细:Asynchronous I/O for External Data Access ,也有一些翻译文章Flink学习笔记:异步I/O访问外部数据,对应Github代码示例在AsyncIOExa

networks:  net:    external: trueservices:  jobmanager1:    restart: always    image: apache/flink:1.16.3    container_name: jobmanager1    hostname: jobmanager1    ports:     - '8081:8081'    volumes:      - /etc/localtime:/etc/localtime      - /home/sumengnan/apache/flink/timezone:/etc/timezone      - /home/sumengnan/apache/flink/conf/flink-conf-jobmanager1.yaml:/opt/flink/conf/flink-conf.yaml      - /home/sumengnan/apache/flink/conf/log4j.properties:/opt/flink/conf/log4j.properties      - /home/sumengnan/apache/flink/conf/logback.xml:/opt/flink/conf/logback.xml      - /home/sumengnan/apache/flink/conf/log4j-console.properties:/opt/flink/conf/log4j-console.properties      - /home/sumengnan/apache/flink/conf/logback-console.xml:/opt/flink/conf/logback-console.xml      - /home/sumengnan/apache/flink/data:/opt/flink/data      - /home/sumengnan/apache/flink/log:/opt/flink/log      - /home/sumengnan/apache/flink/tmp:/opt/flink/tmp    networks:      - net  jobmanager2:    restart: always    image: apache/flink:1.16.3    container_name: jobmanager2    hostname: jobmanager2    ports:     - '8082:8081'    volumes:      - /etc/localtime:/etc/localtime      - /home/sumengnan/apache/flink/timezone:/etc/timezone      - /home/sumengnan/apache/flink/conf/flink-conf-jobmanager2.yaml:/opt/flink/conf/flink-conf.yaml      - /home/sumengnan/apache/flink/conf/log4j.properties:/opt/flink/conf/log4j.properties      - /home/sumengnan/apache/flink/conf/logback.xml:/opt/flink/conf/logback.xml      - /home/sumengnan/apache/flink/conf/log4j-console.properties:/opt/flink/conf/log4j-console.properties      - /home/sumengnan/apache/flink/conf/logback-console.xml:/opt/flink/conf/logback-console.xml      - /home/sumengnan/apache/flink/data:/opt/flink/data      - /home/sumengnan/apache/flink/log:/opt/flink/log      - /home/sumengnan/apache/flink/tmp:/opt/flink/tmp    networks:      - net    depenes_on:      - jobmanager1  taskmanager1:    restart: always    image: apache/flink:1.16.3    container_name: taskmanager1    hostname: taskmanager1    command: taskmanager    volumes:      - /etc/localtime:/etc/localtime      - /home/sumengnan/apache/flink/timezone:/etc/timezone      - /home/sumengnan/apache/flink/conf/flink-conf-taskmanager1.yaml:/opt/flink/conf/flink-conf.yaml      - /home/sumengnan/apache/flink/conf/log4j.properties:/opt/flink/conf/log4j.properties      - /home/sumengnan/apache/flink/conf/logback.xml:/opt/flink/conf/logback.xml      - /home/sumengnan/apache/flink/conf/log4j-console.properties:/opt/flink/conf/log4j-console.properties      - /home/sumengnan/apache/flink/conf/logback-console.xml:/opt/flink/conf/logback-console.xml      - /home/sumengnan/apache/flink/data:/opt/flink/data      - /home/sumengnan/apache/flink/log:/opt/flink/log      - /home/sumengnan/apache/flink/tmp:/opt/flink/tmp    networks:      - net    depenes_on:      - jobmanager1      - jobmanager2  taskmanager2:    restart: always    image: apache/flink:1.16.3    container_name: taskmanager2    hostname: taskmanager2    command: taskmanager    volumes:      - /etc/localtime:/etc/localtime      - /home/sumengnan/apache/flink/timezone:/etc/timezone      - /home/sumengnan/apache/flink/conf/flink-conf-taskmanager2.yaml:/opt/flink/conf/flink-conf.yaml      - /home/sumengnan/apache/flink/conf/log4j.properties:/opt/flink/conf/log4j.properties      - /home/sumengnan/apache/flink/conf/logback.xml:/opt/flink/conf/logback.xml      - /home/sumengnan/apache/flink/conf/log4j-console.properties:/opt/flink/conf/log4j-console.properties      - /home/sumengnan/apache/flink/conf/logback-console.xml:/opt/flink/conf/logback-console.xml      - /home/sumengnan/apache/flink/data:/opt/flink/data      - /home/sumengnan/apache/flink/log:/opt/flink/log      - /home/sumengnan/apache/flink/tmp:/opt/flink/tmp    networks:      - net    depenes_on:      - jobmanager1      - jobmanager2  taskmanager3:    restart: always    image: apache/flink:1.16.3    container_name: taskmanager3    hostname: taskmanager3    command: taskmanager    volumes:      - /etc/localtime:/etc/localtime      - /home/sumengnan/apache/flink/timezone:/etc/timezone      - /home/sumengnan/apache/flink/conf/flink-conf-taskmanager3.yaml:/opt/flink/conf/flink-conf.yaml      - /home/sumengnan/apache/flink/conf/log4j.properties:/opt/flink/conf/log4j.properties      - /home/sumengnan/apache/flink/conf/logback.xml:/opt/flink/conf/logback.xml      - /home/sumengnan/apache/flink/conf/log4j-console.properties:/opt/flink/conf/log4j-console.properties      - /home/sumengnan/apache/flink/conf/logback-console.xml:/opt/flink/conf/logback-console.xml      - /home/sumengnan/apache/flink/data:/opt/flink/data      - /home/sumengnan/apache/flink/log:/opt/flink/log      - /home/sumengnan/apache/flink/tmp:/opt/flink/tmp    networks:      - net    depenes_on:      - jobmanager1      - jobmanager2
最新发布
04-04
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