Hadoop Java program runs

1. Right-click Project and select Maven build to generate the jar file.

2. Generate input File:

Hadoop fs-put Input File path folder Example:hadoop fs-put $HADOOP _home/hadoop-wordcount/input/inputhadoop fs-ls input

3. Run the Java file:

Hadoop Jar Jar file path package name. file name input file output file Example:hadoop jar $HADOOP _home/hadoop-wordcount/wordcount.jar WordCount Input Output

4, view output file

Hadoop fs-ls outputhadoop Fs-cat output/*

If you want to display System.out.println files:

Easy-to-access the logs is Http://localhost:50030/jobtracker.jsp->click on the completed Job->click on map or re Duce Task->click on Tasknumber->task logs->stdout logs.

Hadoop Java program runs