在hadoop中执行MapReduce作业期间如何在控制台上打印 [英] How to print on console during MapReduce job execution in hadoop

问题描述

我想在控制台上执行后打印地图"的每一步.

I want to print each step of my "map" after its execution on the console.

有点像

System.out.println("完成第一步");System.out.println("完成第二步");

System.out.println("Completed Step one"); System.out.println("Completed Step two");

等等

是否有一个特殊的命令可以做到这一点，或者根本不可能，因为 System.out.println 似乎根本不起作用?

Is there a special command to do that or is it not possible at all, as System.out.println doesn't seem to work at all ?

请指导

推荐答案

您可以使用 System.out.println(...要查看打印的内容，请打开 jobtracker Web 控制台.然后导航到您提交的作业的链接.在作业页面上，您将看到指向所有单独的 Map/Reduce 任务的链接.点击这些链接.. 您将找到一个链接，该链接显示标准输出以及标准错误的转储.

You can use System.out.println(... To see whats been printed, open the jobtracker web console. Then navigate to your submitted job's link. On the Job page, you will see links to all your individual Map/Reduce tasks. Follow the links.. you will find a link that displays the dump of both the Standard output as well as the Standard error.

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