Hadoop MapReduce Next Generation - Setting up a Single Node Cluster. Purpose This document describes how to set up and configure a single-node Hadoop installation so that you can quickly perform simple operations using Hadoop MapReduce and the Hadoop…

Hadoop: Setting up a Single Node Cluster. Hadoop: Setting up a Single Node Cluster. Purpose Prerequisites Supported Platforms Required Software Installing Software Download Prepare to Start the Hadoop Cluster Standalone Operation Pseudo-Distributed O…

1.安装JDK7 rpm到/usr/java/jdk1.7.0_40,并建立软链接/usr/java/default到/usr/java/jdk1.7.0_40 [root@server-308 ~]# rpm -ivh jdk-7u40-linux-x64.rpm Preparing... ########################################### [100%] 1:jdk ########################################### [1…

Purpose(目标) This document describes how to set up and configure a single-node Hadoop installation so that you can quickly perform simple operations using Hadoop MapReduce and the Hadoop Distributed File System (HDFS). 这个文档描述了如何安装和配置一个单节点的Hadoop安装,这样很…

In this tutorial I will describe how to write a simpleMapReduce program for Hadoop in thePython programming language. Motivation Even though the Hadoop framework is written in Java, programs for Hadoop need not to be coded in Java but can also bedeve…

一直在搞spark,也没时间弄hadoop,不过Hadoop基本的编程我觉得我还是要会吧,看到一篇不错的文章,不过应该应用于hadoop2.0以前,因为代码中有  conf.set("mapred.job.tracker", "192.168.1.2:9001");新框架中已改为 Yarn-site.xml 中的 resouceManager 及 nodeManager 具体配置项,新框架中历史 job 的查询已从 Job tracker 剥离,归入单独的mapre…

In this tutorial I will describe how to write a simple MapReduce program for Hadoop in the Python programming language. Motivation Even though the Hadoop framework is written in Java, programs for Hadoop need not to be coded in Java but can also be d…

本文发表于本人博客. 今天接着上次[Hadoop mapreduce自定义排序WritableComparable]文章写,按照顺序那么这次应该是讲解自定义分组如何实现,关于操作顺序在这里不多说了,需要了解的可以看看我在博客园的评论,现在开始. 首先我们查看下Job这个类,发现有setGroupingComparatorClass()这个方法,具体源码如下: /** * Define the comparator that controls which keys are grouped toge…

背景 随着集群规模和负载增加,MapReduce JobTracker在内存消耗,线程模型和扩展性/可靠性/性能方面暴露出了缺点,为此需要对它进行大整修. 需求 当我们对Hadoop MapReduce框架进行改进时,需要时刻谨记的一个重要原则是用户的需求.近几年来,从Hadoop用户那里总结出MapReduce框架当前最紧迫的需求有: (1)可靠性(Reliability)– JobTracker不可靠 (2)可用性(Availability)– JobTracker可用性有问题 (3) 扩展…

不多说,直接上代码. 天气记录数据库 Station ID Timestamp Temperature 气象站数据库 Station ID Station Name 气象站和天气记录合并之后的示意图如下所示. Station ID Station Name Timestamp Temperature 011990-99999 SIHCCAJAVRI 195005150700 0 011990-99999 SIHCCAJAVRI 195005151200 22 011990-99999 SIHCC…