Adding a JAR path to Hadoop classpath

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This is simple, but it is a frequent question:

If we need to add some specific path pointing to a thirdparty library we can run a command like the following:

$ export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:/home/hadoop/.versions/Cascading-2.5-SDK/binary/cascading/*:/home/hadoop/.versions/Cascading-2.5-SDK/binary/cascading/lib/cascading-core/*

Here I am adding two directories to the hadoop classpath:

/home/hadoop/.versions/Cascading-2.5-SDK/binary/cascading/*
/home/hadoop/.versions/Cascading-2.5-SDK/binary/cascading/lib/cascading-core/*

We can check the hadoop classpath with the following command:

$ hadoop classpath

 

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