Q. How does the jobtracker divide input data in a Hadoop MapReduce cluster?

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Q. What is the default number of map and reduce slots on a tasktracker in Hadoop?

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Q. Why does the Hadoop master represent a single point of failure?

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Q. What is the primary design goal of the Hadoop Distributed File System (HDFS)?

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Q. What is the role of the namenode in HDFS?

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Q. What is the default block size in HDFS?

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Q. What is the purpose of the replication factor in HDFS?

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Q. How does HDFS ensure fault tolerance for data blocks?

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Q. What is the role of splits in the MapReduce process?

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Q. What is the purpose of the circular memory buffer in a map task?

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Q. When does a map task write its partial output data to disk?

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Q. What is the purpose of the copy phase in reduce tasks?

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Q. In Hadoop MapReduce, when is the output of the reduce() function written to the distributed file system?

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Q. What does the replication factor in HDFS determine?

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Q. What is the role of the jobtracker in Hadoop MapReduce?

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Q. Which phase in a MapReduce job is responsible for sorting the map output data?

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Q. In Hadoop MapReduce, how are map tasks distributed across the cluster?

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Q. What is the purpose of splits in Hadoop MapReduce?

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