Apache Spark - MapReduce example and difference between hadoop and spark engine

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In which scenario I should use Spark or Map-Reduce? What if I have a petabyte file and want to get count of some words?

SQLwithManoj
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thanks a lot.Your videos are very informative

sparkguy
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Great video. I'm using the Cloudera quickstart VM to learn Hadoop-Spark and I need your help.
Basically, it's the first time i'm working on Linux and Hadoop. I have chosen Cloudera's VM since it saves me the time to setup. I want to run the code explained in the video for which I will also need the dataset. It would be very kind of you if you could guide me. Thanks
Arjun

arjunpmm
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