hadoop概念学习体系结构

Hadoop HDFS概念学习系列之HDFS的体系结构（十七）

下面简单介绍Hadoop是采用哪种机制来确保NameNode的安全的。第一种方法是，备份NameNade上持久化存储的元数据文件，然后将其转储到其他文件系统中，这种转储是同步的、原子的操作。通常的实现方法是，将NameNode中的元数据转储到远程的NFS...

Hadoop MapReduce概念学习系列之MapReduce的体系结构（二）

在Hadoop的体系结构中，MapReduce是一个简单易用的软件框架，基于它可以将任务分发到由上千台商用机器组成的集群上，并以一种可靠容错的方式并行处理大量的数据集，实现Hadoop的并行任务处理功能。MapReduce框架是由一个单独运行在主节点的...

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