hadoop程序的相关内容

问答 2021-12-04 来自：开发者社区

在window的Eclipse运行Hadoop程序报错，求大侠帮忙分析?报错

Eclipse安装在window下，Hadoop集群安装在虚拟机上面在Eclipse运行Wordcount程序报这个错，求大侠指教 log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please i...

问答 2020-01-13 来自：开发者社区

各位大佬，请教一个问题使用python Hadoop streaming程序，如何输出自己的日志

各位大佬，请教一个问题使用python Hadoop streaming程序，如何输出自己的日志内容，比如存到hdfs节点或者其他地方？

问答 2018-05-10 来自：开发者社区

按阿里云官方文档配的参数，任务还是提交时报错。。。能给我一个详细的参数配置吗。。jar oss://my-emr-test/examples-1.1.jar com.aliyun.emr.example.spark.WordCount Dwordcount.case.sensitive=trueDfs.oss.accessKeyID=LTAI7ywkrd1s3odXDfs.oss.accessK....

文章 2018-01-25 来自：开发者社区

高可用Hadoop平台－运行MapReduce程序

1.概述　　最近有同学反应，如何在配置了HA的Hadoop平台运行MapReduce程序呢？对于刚步入Hadoop行业的同学，这个疑问却是会存在，其实仔细想想，如果你之前的语言功底不错的，应该会想到自动重连，自动重连也可以帮我我们解决运行MapReduce程序的问题。然后，今天我赘述的是利用Hadoop的Java API 来实现。 2.介绍　　下面直接附上代码，代码中我都有注释。 2.1Ja....

文章 2017-11-26 来自：开发者社区

运行Hadoop自带的wordcount单词统计程序

1.使用示例程序实现单词统计（1）wordcount程序 wordcount程序在hadoop的share目录下，如下： 1 2 3 4 5 6 7 8 9 [root@leaf mapreduce]# pwd /usr/local/hadoop/share/hadoop/mapreduce [root@leaf mapreduce]#&...

文章 2017-11-22 来自：开发者社区

hadoop 测试第一个mapreduce程序

说明：测试hadoop自带的实例 wordcount程序（此程序统计每个单词在文件中出现的次数） 2.6.0版本jar程序的路径是 /usr/local/hadoop-2.6.0/share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0.jar 一、在本地创建目录和文件创建目录： mkdir /home/hadoop/input cd ...

文章 2017-11-15 来自：开发者社区

Hadoop MapReduce概念学习系列之mr程序组件全貌（二十）

其实啊,spilt是，控制Apache Hadoop Mapreduce的map并发任务数，详细见http://www.cnblogs.com/zlslch/p/5713652.html map，是mapper代码 reduce，是reducer代码缓存，分组，排序，转发， ...

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