如何在Hadoop环境中执行用Java编写的Hadoop Job

Question

I have class files loaded on to Hadoop file system.And also i have loaded input file to hdfs. When I run class file through hadoop command in terminal i get Class not found error. EG: I have HDFS contents as WordCount.class WordCountMapper.class WordCOuntReducer.class SampleInpujt.txt

Can Some one correct me where i am doing wrong.Or is this can be done in real.

Answer 1

Below is the commandline we use for running a Java mapreduce job on our 4-node Hadoop-2.2.0 cluster daily and it works fine. We run it from the namenode but any machine in the cluster should work fine.

hadoop jar ~/..path../mr_orchestrate/target/mr-orchestrate-1.0.jar com.rr.ap.orchestrate.MROrchestrate /user/hduser/in/Sample_15Feb2014.txt /user/hduser/out/out15Feb2014 

You may need the "-libjars" option to add other library paths.