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Why is it required to set Hadoop home to Winutils.exe folder if Hadoop is not mandatry for Spark?

 
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Hadoop is not mandatory for running Apache Spark programs. However if I am running spark word count sample application  from Eclipse it gives error and works only when I set Hadoop home to the path of folder containing Winutils.exe. Why is it required when Hadoop is not mandatory for Spark?

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When asking questions, please TellTheDetails. It would be useful if you gave us the error and stack trace. Also tell us what you did to "set the Hadoop home".
 
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