音乐排行榜

- 日理万妓 2024-04-17 15:17 75阅读 0赞

实验目的

理解HDFS、MapReduce和Hbase的集成使用
    掌握快速导入数据到Hbase的方法
    掌握利用MapReduce接受Hbase数据输入
    掌握利用MapReduce输出到Hbase的应用

一、 MapReduce与Hbase的集成  
1、 将hbase-site.xml文件复制到$HADOOP\_HOME/etc/hadoop下

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2、编译$HADOOP\_HOME/etc/hadoop/hadoop-env.sh文件，增加以下内容  
![在这里插入图片描述][20190827202935929.PNG]  
![在这里插入图片描述][20190827203016416.PNG]  
测试环境是否配置正确  
![在这里插入图片描述][20190827203034453.PNG]  
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二、音乐排行榜实现流程  
1、批量数据导入  
(1)将测试数据生成.txt文件，各列之间使用制表符进行分割，并将文件上传至HDFS目录：/input2/music  
![在这里插入图片描述][20190827203114905.PNG]  
![在这里插入图片描述][20190827203118260.PNG]  
![在这里插入图片描述][20190827203121730.PNG]  
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(2)通过importtsv准备数据，从MapReduce作业生成Hbase数据文件HFile到指定目录temp  
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(3)通过importtsv命令运行成功后可在/user/hduser/temp目录下找到生成的HFile文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 6]  
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(4)通过浏览器访问地址http://192.168.10.111:8088  
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(5)使用completebulkload将temp目录移动到Hregion中完成数据加载  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 10]  
(6)查看将测试数据导入到Hbase  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 11]  
2、Hbase MapReduce API-运行TableMapperDemo  
自定义TableMapper  
![在这里插入图片描述][20190827203503451.PNG]  
运行TableMapper  
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![在这里插入图片描述][20190827203539571.PNG]  
手动加载MapReduce与Hbase的第三方依赖包文件（此代码注释掉，不执行）  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 14]  
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修改集群中所有节点的yarn-site.xml文件，添加如下内容  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 16]  
手动加载MapReduce与HBase的第三方依赖包文件；选中要导出的程序并单击鼠标右键，选择Export  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 17]  
将生成TableMapperDemo的jar文件，并放入hadoop集群  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 18]  
添加第三方依赖文件，使用-libjars手动添加jar文件  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 19]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 20]  
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在Eclipse上运行不了主要是因为Eclipse找不到那个类，可以通过项目打包成jar包，然后为程序指定jar文件路径  
![在这里插入图片描述][2019082720383328.PNG]  
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遇到问题：  
在使用completebulkload将temp目录移动到HRegion中完成数据加载时，由于输出的路径因为配置文件不同而导致错误。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 26]![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDQ5NTY3OA_size_16_color_FFFFFF_t_70 27]  
解决办法：使用completebulkload将temp目录写成完整路径。

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