log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory). log4j:WARN Please initialize the log4j system properly. log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info. Exce…

mapreduce.framework.name默认是local: <property><name>mapreduce.framework.name</name><value>yarn</value></property>…

  An exception occured while performing the indexing job : java.io.IOException: Cannot initialize Cluster. Please check your configuration for mapreduce.framework.name and the correspond server addresses.     at org.apache.hadoop.mapreduce.Cluster.in…

解决方法: <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-mapreduce-client-common</artifactId> <version></version> </dependency>…

添加一下依赖 <dependency> <groupId>org.apache.hadoop</groupId> <artifactId>hadoop-mapreduce-client-jobclient</artifactId> <version></version> </dependency>…

2016-12-21  16:53:49 mapred-default.xml mapreduce.input.fileinputformat.split.minsize 0 The minimum size chunk that map input should be split into. Note that some file formats may have minimum split sizes that take priority over this setting. 2016-12…

Job类 /**   * Define the comparator that controls    * how the keys are sorted before they   * are passed to the {@link Reducer}.   * @param cls the raw comparator   * @see #setCombinerKeyGroupingComparatorClass(Class)   */    publicvoid setSortCompar…

近期为了分析国内航空旅游业常见安全漏洞,想到了用大数据来分析,其实数据也不大,只是生产项目没有使用Hadoop,因此这里实际使用一次. 先看一下通过hadoop分析后的结果吧,最终通过hadoop分析国内典型航空旅游业厂商的常见安全漏洞个数的比例效果如下: 第一次正式使用Hadoop,肯定会遇到非常多的问题,参考了很多网络上的文章,我把自己从0搭建到使用的过程记录下来,方便以后自己或其他人参考. 之前简单用过storm,适合实时数据的处理.hadoop更偏向静态数据的处理,网上很多hadoop的…

hadoop2.x改进了hadoop1.x的架构, 具体yarn如何工作以及改进了什么可以在网上学, 这里仅记录我个人搭建的问题和理解,希望能帮助遇到困难的朋友. 在开始前,必须了解yarn版本的mapreduce框架基础组件包括1个resourcemanager和每个slave上各1个nodemanager,其他进程均由mapreduce任务动态创建. 1,怎么简单高效的部署分布式集群? 答:先在1台机器上准备好hadoop和java环境,将java和hadoop的jar包环境变量写到.bas…

转自http://prinx.blog.163.com/blog/static/190115275201211128513868/和http://www.cnblogs.com/jie465831735/archive/2013/03/06.html 按如下顺序看效果最佳: 1.       MapReduce Simplied Data Processing on Large Clusters 2.       Hadoop环境的安装 By 徐伟 3.       Parallel K-Mea…