mapred-site.xml中的mapreduce.framework.name的经典本地区别是什么？ [英] What is the difference between classic, local for mapreduce.framework.name in mapred-site.xml?

问题描述

这个参数的官方描述如下：

The official description for this parameter is as follows:

The runtime framework for executing MapReduce jobs. Can be one of local, classic or yarn.

我知道'yarn'的值是针对MRv2的，它会将mapreduce作业提交给resourcemanager。但本地和古典有什么区别？哪一个对应于MRv1？

I know that the value 'yarn' is for MRv2, which will submit the mapreduce job to resourcemanager. But what is the difference between local and classic? Which one is corresponding to MRv1?

非常感谢！

Thanks a lot!

推荐答案

你说得对，纱代表MRv2。 经典用于MRv1，本地用于MR作业的本地运行。但为什么你需要MRv1？ Yarn现在不在测试阶段，它比旧的MRv1框架更稳定，而您的MapReduce作业仍然可以使用旧的mapredAPI

You are right, "yarn" stands for MRv2. "classic" is for MRv1 and "local" for local runs of the MR jobs. But why do you need MRv1? Yarn is out of the beta now and it is more stable than old MRv1 framework, while your MapReduce jobs still can use old "mapred" API

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