Using the **MapReduce framework**, explain how you would find the second-degree friends for each user in a social network. Provide a brief description and a sample code for the solution.

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Explain how to implement **MapReduce** for the following common problems: **word count**, **inverted index**, and **mean calculation**. Provide a brief description and a sample code for each problem.

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**MapReduce Random Lines from Large Log Files:**Using the MapReduce framework, how would you get X amount of random lines from large log files?**Managing a Pool of IPs:**Describe how you would design a system to manage a pool of IP addresses, ensuring efficient allocation and deallocation.**Rotated Array Search:**Given a rotated sorted array, write a Python function to search for a target value. Explain your approach and provide the solution.

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What is Big Data and what is Hadoop used for?

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