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以最少的停机时间部署Java webapps的最佳做法？(Best practices for deploying Java webapps with minimal downtime?)

 当部署大型Java webapp（> 100 MB .war）时，我目前正在使用以下部署过程：  
 
  应用程序.war文件在开发机器上本地扩展。  
  扩展的应用程序是rsync：从开发机器到实时环境。  
  rsync之后重新启动实时环境中的应用服务器。 此步骤不是严格需要的，但是我发现在部署时重新启动应用程序服务器会因为频繁的加载而避免使用“java.lang.OutOfMemoryError：PermGen space”。  
 
 关于这种方法的好东西：  
 
  rsync将从开发机器发送到实时环境的数据量最小化。 上传整个.war文件需要十分钟，而rsync需要几秒钟的时间。  
 
 关于这种方法的坏事：  
 
  rsync正在运行时，由于文件被更新，应用程序上下文将重新启动。 理想情况下，重新启动应该在rsync完成后发生，而不是当它仍在运行时。  
  应用服务器重新启动会导致大约两分钟的停机时间。  
 
 我想找到具有以下属性的部署过程：  
 
  部署过程中的最短停机时间。  
  上传数据时间最短。  
  如果部署过程是应用程序服务器特定的，则应用服务器必须是开源的。  
 
 题：  
 
  根据规定的要求，什么是最佳的部署过程？  

When deploying a large Java webapp (>100 MB .war) I'm currently use the following deployment process: 
 
 The application .war file is expanded locally on the development machine. 
 The expanded application is rsync:ed from the development machine to the live environment. 
 The app server in the live environment is restarted after the rsync. This step is not strictly needed, but I've found that restarting the application server on deployment avoids "java.lang.OutOfMemoryError: PermGen space" due to frequent class loading. 
 
Good things about this approach: 
 
 The rsync minimizes the amount of data sent from the development machine to the live environment. Uploading the entire .war file takes over ten minutes, whereas an rsync takes a couple of seconds. 
 
Bad things about this approach: 
 
 While the rsync is running the application context is restarted since the files are updated. Ideally the restart should happen after the rsync is complete, not when it is still running. 
 The app server restart causes roughly two minutes of downtime. 
 
I'd like to find a deployment process with the following properties: 
 
 Minimal downtime during deployment process. 
 Minimal time spent uploading the data. 
 If the deployment process is app server specific, then the app server must be open-source. 
 
Question: 
 
 Given the stated requirements, what is the optimal deployment process? 

原文：https://stackoverflow.com/questions/1640333

更新时间：2024-05-03 18:05

最满意答案

 那就是LINQ的Select - ie  
var newSequence = originalSequence.Select(x => {translation});
 
 要么  
var newSequence = from x in originalSequence
                  select {translation};

That is LINQ's Select - i.e. 
var newSequence = originalSequence.Select(x => {translation});
 
or 
var newSequence = from x in originalSequence
                  select {translation};

以最少的停机时间部署Java webapps的最佳做法？(Best practices for deploying Java webapps with minimal downtime?)

最满意答案

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