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**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
of this software and associated documentation files (the "Software"), to deal


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# 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)

**Features:**


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docs/content/user-guide/zh/cap/idempotence.md View File

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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

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)
* At Most Once (最多一次)


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