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Which is the difference between running
a map reduce job doing
/bin/hadoop -jar /file.jar input output
and import jars in eclipse and run the code ?
The first command runs the job on the Hadoop cluster as configured in
$HADOOP_HOME/conf. This cluster might be remote, might be a pseudo-distributed cluster or might be local.Running in Eclipse runs it locally. It runs the mappers and reducers locally in the same JVM.