Commit 226d42a8 authored by Savorboard's avatar Savorboard

update docs

parent 494a8079
...@@ -2,7 +2,7 @@ ...@@ -2,7 +2,7 @@
**MIT License** **MIT License**
Copyright (c) 2016 - 2019 Saborboard Copyright (c) 2016 - 2019 Savorboard
Permission is hereby granted, free of charge, to any person obtaining a copy Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal of this software and associated documentation files (the "Software"), to deal
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# Release Notes # Release Notes
## Version 2.5.1 (2019-06-21)
**Features:**
* Improved logs record.
* Upgrade dependent nuget packages version. (MySqlConnector, confluent-kafka-dotnet-1.0 )
* NodeId type change to string of DiscoveryOptions for Consul. (#314)
* Change the IConsumerServiceSelector interface access modifier to public. (#333)
* Improved RabbitMQOptions to provide extensions option to configure the client original configuration. (#350)
* Add index for MongoDB CAP collections. (#353)
**Bugs Fixed:**
* Fixed consumer re-register transport bug. (#329)
* Handle messages retrieval failure. (#324)
* Fixed DiagnosticListener null reference exception bug. (#335)
* Add subscription name validation for the AzureServerBus. (#344)
* Fixed thread safety issues of publisher. (#331)
## Version 2.5.0 (2019-03-30) ## Version 2.5.0 (2019-03-30)
**Features:** **Features:**
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# Idempotence # 幂等性
幂等性(你可以在[Wikipedia](https://en.wikipedia.org/wiki/Idempotence)读到关于幂等性的定义),当我们谈论幂等时,一般是指可以重复处理传毒的消息,而不是产生意外的结果。 幂等性(你可以在[Wikipedia](https://en.wikipedia.org/wiki/Idempotence)读到关于幂等性的定义),当我们谈论幂等时,一般是指可以重复处理传递的消息,而不会产生意外的结果。
## 交付保证 ## 交付保证
在说幂等性之前,我们先来说下关于消费端的消息交付。 在说幂等性之前,我们先来说下关于消费端的消息交付。
由于CAP不是使用的 MS DTC 或其他类型的2PC分布式事务机制,所以存在至少消息严格交付一次的问题,具体的说在基于消息的系统中,存在下三种可能: 由于CAP不是使用的 MS DTC 或其他类型的2PC分布式事务机制,所以存在至少消息严格交付一次的问题,具体的说在基于消息的系统中,存在下三种可能:
* Exactly Once(*) (仅有一次) * Exactly Once(*) (仅有一次)
* At Most Once (最多一次) * At Most Once (最多一次)
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