java - Hadoop 减少端连接不起作用

Question

当我尝试显示 here 所示的相同示例时，我看到以下输出，但它不会进一步进行。

请指教。

我的 DataJoin.jar 包含以下库:

• hadoop-common.jar
• hadoop-datajoin-2.0.0.-cdh4.0.0.jar
• hadoop-mapreduce-client-core.jar
• hadoop-datajoin.jar

这是一些代码:

$ hadoop jar DataJoin.jar /user/cloudera/join/reduceside/inp /user/cloudera/join/reduceside/out    
14/01/10 12:00:09 WARN mapred.JobClient: Use GenericOptionsParser for parsing the arguments. Applications should implement Tool for the same.    
14/01/10 12:00:09 INFO mapred.FileInputFormat: Total input paths to process : 2    
14/01/10 12:00:10 INFO mapred.JobClient: Running job: job_201401100935_0010  
14/01/10 12:00:11 INFO mapred.JobClient:  map 0% reduce 0%

Answer 1

关于减少侧连接的一个很好的教程，您可以在这里引用[ http://www.oodlestechnologies.com/blogs/Reduce-side-join-in-hadoop-%3A-Data-analyses-from-different-types-of-data-sources]