Answer / Shashwat Gupta

"Hadoop 1 (previously known as Apache Hadoop) focuses on batch processing, while Hadoop 2 introduces a new component called YARN (Yet Another Resource Negotiator), which allows for more efficient resource management and supports both batch and real-time data processing. Additionally, Hadoop 2 includes improvements in security, scalability, and interoperability with other big data technologies."n

In hadoop_pid_dir, what does pid stands for?

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What are the different commands used to startup and shutdown Hadoop daemons?

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Why do we need hadoop for big data analytics?

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What is LazyOutputFormat in Hadoop?

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Ideally what should be the replication factor in hadoop?

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What is difference between reducer and combiner?

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What are the main components of hadoop?

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Clarify how job tracker schedules an assignment?

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What is Mapper in Hadoop?

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Explain how jobtracker schedules a task?

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Clarify what webdav is in hadoop?

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What jobtracker is in hadoop? What are the activities followed by hadoop?

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