hadoop installed how write use the WordCount example?

I'm really new to Hadoop and not familiar to terminal commands. I followed step by step to install hadoop on my mac and can run some inner hadoop examples. However, when i tried to run the WordCount example, it generate many errors such as org.apache can't be resolved. The post online said you should put it in where you write your java code.. I used to use eclipse. However, in Eclipse there're so many errors that the project was enable to be compiled.

And suggestion? Thanks!

Answers


Assuming you have also followed the directions to start up a local cluster, or pseudo-distributed cluster, then here is the easiest way.

Go to the hadoop directory, which should be whatever directory is unzipped when you download the hadoop library from apache. From there you can run these command to run hadoop

for Hadoop version 0.23.*

cd $HOME/path/to/hadoop-0.23.* ./bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-0.23.5.jar wordcount myinput outputdir

for Hadoop version 0.20.*

cd $HOME/path/to/hadoop-0.20.* ./bin/hadoop jar hadoop-0.20.2-examples.jar wordcount myinput outputdir


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