Symptoms Consider the following scenario: In Microsoft SQL Server 2017, you have a distribution agent that does not use a default agent profile. The distribution database is added to the availability group (AG). The primary replica of the distributio…

RAC: Frequently Asked Questions [ID 220970.1]   修改时间 13-JAN-2011     类型 FAQ     状态 PUBLISHED   Applies to: Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 11.2.0.1 - Release: 9.2 to 11.2 Purpose Frequently Asked Questions for Real Applicatio…

首先看server端:class NettyRemotingServer extends NettyRemotingAbstract implements RemotingServer 下面这个实现了com.alibaba.rocketmq.remoting.RemotingService中的start方法.启动通信服务端 @Override public void start() { this.defaultEventExecutorGroup = new DefaultEventExecut…

两篇精彩的文章: <RocketMQ源码 — 三. Producer消息发送过程> <RocketMQ源码解析:Message存储> rocketmq通过netty获取到消息请求后,直接掉处理模块,比如:SendMessageProcessor 这个处理类主要负责处理客户端发送消息的请求. 这个类实现了com.alibaba.rocketmq.remoting.netty.NettyRequestProcessor接口.这个接口下一共两个方法: RemotingCommand pr…

1. 收不到消息-consumerOffset.json 信息错位 这种情况一般是,手动删除了store/commitlog目录里的数据等非常规手段造成了consumerOffset.json中记录的还是原来的信息,导致consumer收不到消息. rocketmq的broker,一个消息主题对应多个队列,这些队列的消费进度会记录在consumerOffset.json文件中.所以一旦这个文件中记录的还是老的offset信息,那么既然就消费不到消息. 一个主题对应几个队列,是记录在$home/s…

Disclosed herein is a Residential Gateway (RG) system for home network service. The RG system receives various supplementary services through a Home Network Serving Node (HNSN) that provides home network service. The system includes an Open Service G…

Return value/code Description 0x00030200 STG_S_CONVERTED The underlying file was converted to compound file format. 0x00030201 STG_S_BLOCK The storage operation should block until more data is available. 0x00030202 STG_S_RETRYNOW The storage operatio…

1.概述 Producer 发送消息.主要是同步发送消息源码,涉及到 异步/Oneway发送消息,事务消息会跳过. Broker 接收消息.(存储消息在<RocketMQ 源码分析 —— Message 存储>解析) 2.Producer 发送消息 DefaultMQProducer#send(Message) 1: @Override 2: public SendResult send(Message msg) throws MQClientException, RemotingExcept…

上一讲[RocketMQ]消息的拉取 消息消费 当RocketMQ进行消息消费的时候,是通过ConsumeMessageConcurrentlyService的submitConsumeRequest方法,将消息提交到线程池中进行消费,具体的处理逻辑如下: 如果本次消息的个数小于等于批量消费的大小consumeBatchSize,构建消费请求ConsumeRequest,直接提交到线程池中进行消费即可 如果本次消息的个数大于批量消费的大小consumeBatchSize,说明需要分批进行提交,每…

编写views views:作为MVC中的C,接收用户的输入,调用数据库Model层和业务逻辑Model层,处理后将处理结果渲染到V层中去. polls/views.py: from django.http import HttpResponse # Create your views here. def index(request): return HttpResponse("Hello, world. You're at the polls index.") 编写urls urls…