Question

http://hadoop.apache.org/docs/r2.1.0-beta/hadoop-yarn/hadoop-yarn-site/WritingYarnApplications.html

我试图通过上面的链接使示例正常工作。但我无法编译下面的代码

 Resource capability = Records.newRecord(Resource.class);
 capability.setMemory(512);
 amContainer.setResource(capability);

 // Set the container launch content into the
 // ApplicationSubmissionContext
 appContext.setAMContainerSpec(amContainer);

amContainer是ContainerLaunchContext，我的hadoop版本是2.1.0-beta。我做了一些调查。我发现ContainerLaunchContext中没有方法“setResource”

我对此有3个问题 1）方法已被删除或什么？
2）如果方法已被删除，我现在该怎么办？
3）有没有关于纱线的文档，因为我发现网站上的文档很容易，我希望我能得到一本手册或者其他东西。例如， capability.setMemory（512）; 根据代码中的评论，我不知道它是512k或512M。

Answer 1

这实际上是问题的正确解决方案。以前的答案可能导致执行错误!!!

@Dyin我不能在评论中使用它;）验证为2.2.0和2.3.0

为AppMaster设置资源的驱动程序：

ApplicationSubmissionContext appContext = app.getApplicationSubmissionContext();
ApplicationId appId = appContext.getApplicationId();
appContext.setApplicationName(this.appName);

// Set up the container launch context for the application master
ContainerLaunchContext amContainer = Records.newRecord(ContainerLaunchContext.class);

Resource capability = Records.newRecord(Resource.class);
capability.setMemory(amMemory);        
appContext.setResource(capability);

appContext.setAMContainerSpec(amContainer);

Priority pri = Records.newRecord(Priority.class);
pri.setPriority(amPriority);
appContext.setPriority(pri);

appContext.setQueue(amQueue);

// Submit the application to the applications manager
yarnClient.submitApplication(appContext); // this.yarnClient = YarnClient.createYarnClient();

在ApplicationMaster中，您应该如何为容器（工作人员）指定资源。

private AMRMClient.ContainerRequest setupContainerAskForRM() {
        // setup requirements for hosts
        // using * as any host will do for the distributed shell app
        // set the priority for the request
        Priority pri = Records.newRecord(Priority.class);
        pri.setPriority(requestPriority);

        // Set up resource type requirements
        // For now, only memory is supported so we set memory requirements
        Resource capability = Records.newRecord(Resource.class);
        capability.setMemory(containerMemory);

        AMRMClient.ContainerRequest request = new AMRMClient.ContainerRequest(capability, null, null,
                pri);
        return request;
    }

AppMaster中的某些run（）或main（）方法

AMRMClientAsync.CallbackHandler allocListener = new RMCallbackHandler();
resourceManager = AMRMClientAsync.createAMRMClientAsync(1000, allocListener);
resourceManager.init(conf);
resourceManager.start();

for (int i = 0; i < numTotalContainers; ++i) {
  AMRMClient.ContainerRequest containerAsk = setupContainerAskForRM();
  resourceManager.addContainerRequest(containerAsk); // 
}

启动容器您可以使用原始答案解决方案（java cmd），但它只是一个顶级的樱桃。无论如何它应该有用。

Answer 2

您可以通过推荐设置ApplicationMaster可用的内存。就这样：

// Set the necessary command to execute the application master
Vector<CharSequence> vargs = new Vector<CharSequence>(30);
...
vargs.add("-Xmx" + amMemory + "m"); // notice "m" indicating megabytes, you can use also -Xms combined with -Xmx
... // transform vargs to String commands
amContainer.setCommands(commands);

这应该可以解决您的问题。至于3个问题。纱线是快速发展的软件。我的建议忘了文档，获取源代码并阅读它。这将回答你的很多问题。

ContainerLaunchContext.setResource（）缺少hadoop纱线

2 个答案: