hadoop入门简介

hadoop官网简介：

What Is Apache Hadoop?

The Apache™ Hadoop® project develops open-source software for reliable, scalable, distributed computing.

The Apache Hadoop software library is a framework that allows for the distributed processing of large data sets across clusters of computers using simple programming models. It is designed to scale up from single servers to thousands of machines, each offering local computation and storage. Rather than rely on hardware to deliver high-availability, the library itself is designed to detect and handle failures at the application layer, so delivering a highly-available service on top of a cluster of computers, each of which may be prone to failures.

The project includes these modules:

• Hadoop Common: The common utilities that support the other Hadoop modules.
• Hadoop Distributed File System (HDFS™): A distributed file system that provides high-throughput access to application data.
• Hadoop YARN: A framework for job scheduling and cluster resource management.
• Hadoop MapReduce: A YARN-based system for parallel processing of large data sets.

hadoop实践，见官网：https://hadoop.apache.org/docs/r1.0.4/cn/quickstart.html

1.单机模式

2.伪分布模式

3.完全分布式

ssh认证 /etc/host 复制虚拟机 jps

流程：

数据采集--清洗标记--存储集合--分析挖掘--数据应用

YARN/MapReduce

Spark 内存 大型 低延迟

Strom twitter使用clojure语言

sql：

Hive sql映射为Mapduce/Spark等命令

presto 解决查询效率问题

impala C++开发

可视化：

echarts 百度开源

D3.js

集群管理：

Ambari

zookeeper