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自定义hadoop map/reduce输入文件切割InputFormat

hadoop会对原始输入文件进行文件切割，然后把每个split传入mapper程序中进行处理，FileInputFormat是所有以文件作为数据源的InputFormat实现的基类，FileInputFormat保存作为job输入的所有文件，并实现了对输入文件计算splits的方法。至于获得记录的方...

自定义Hadoop的可序列化类

java原生语言中要想一个自定义类可序列化，很简单，只要让这个类实现java.io.Serializable接口就可以了，但是在Hadoop框架中，要想让自定义类可以被序列化，我们必须手动让其实现WritableCompable接口并且实现write(),readFields(),compareTo...

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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自定义Spark Partitioner提升es-hadoop Bulk效率

前言之前写过一篇文章，如何提高ElasticSearch 索引速度。除了对ES本身的优化以外，我现在大体思路是尽量将逻辑外移到Spark上,Spark的分布式计算能力强，cpu密集型的很适合。这篇文章涉及的调整也是对SparkES 多维分析引擎设计中提及的一个重要概念“shard to part...

通过java api提交自定义hadoop 作业

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更新时间 2024-03-01 15:50:07

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