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Asked: 2026-06-16T03:24:04+00:00

My hadoop version is 0.20.2. Although I type hadoop jar JarWithSeveralMainClasses.jar NonDefaultMainClass args… It

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My hadoop version is 0.20.2.
Although I type

hadoop jar JarWithSeveralMainClasses.jar NonDefaultMainClass args...

It tries to execute main method of MainClassSpecifiedInJarManifest.
Why?

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1 Answer

  1. Editorial Team

    I think you may find your answer here

    If a jar file contains a main class specified in its manifest file, hadoop will take the main class even if the command specify another main class. This is different from normal java execution where we can specify a main class to overwrite the one in the manifest file.

    If a jar file does not contain a main class in manifest file, hadoop allows us to specify the main class.

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