hadoop参数设置-阿里云

Hadoop中的DataNode、工作机制、数据完整性、掉线时限参数设置

@[toc]10.DataNode10.1DataNode工作机制（1）一个数据块在DataNode上以文件形式存储在磁盘上，包括两个文件，一个是数据本身，一个是元数据包括数据块的长度，块数据的校验和，以及时间戳。（2）DataNode启动后向NameNode注册，通过后，周期性（6小时）的向Nam...

大数据实战项目：反爬虫系统（Lua+Spark+Redis+Hadoop框架搭建）第一阶段

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大数据实战项目：反爬虫系统（Lua+Spark+Redis+Hadoop框架搭建）第二阶段

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大数据实战项目：反爬虫系统（Lua+Spark+Redis+Hadoop框架搭建）第三阶段

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Hadoop streaming 排序、分桶参数设置

编写hadoop任务经常需要用到partition和排序。这里记录一下几个参数。 1. 概念 Partition：分桶过程，用户输出的key经过partition分发到不同的reduce里，因而partitioner就是分桶器，一般用平台默认的hash分桶也可以自己指定。Key：是需要排序的字段，相...

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更新时间 2023-04-24 10:40:50

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