Big Data | Hadoop Interview Questions and Answers

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Q: Why does HDFS store data in Block structure?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How much storage is allocated by HDFS for storing a file of 25 MB size?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is the default replication factor in HDFS?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is a Combiner in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How does partitioning work in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is the use of Context object in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What are the primary phases of a Reducer in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What are the core methods of a Reducer in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What will happen when NameNode is down and a user submits a new job?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: Why do we use fsck command in HDFS?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How will you check if a file exists in HDFS?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: If we set Replication factor 3 for a file, does it mean any computation will also take place 3 times?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is the meaning of Rack Awareness in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What happens if HDFS file is set with replication factor of 1 and DataNode crashes?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What are the main functions of Secondary NameNode?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What would happen if NameNode crashes in a HDFS cluster?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What data is stored in a HDFS NameNode?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How does indexing work in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What are the two messages that NameNode receives from DataNode in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is the difference between NAS and DAS in Hadoop cluster?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is Replication factor in HDFS, and how can we set it?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How can we update a file at an arbitrary location in HDFS?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How does inter cluster data copying works in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: Why do we use commodity hardware in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How will you get the distance between two nodes in Apache Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: How will you disable a Block Scanner on HDFS DataNode?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What are the default port numbers on which Name Node, Job Tracker and Task Tracker run in Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What do you know about Block and Block scanner in HDFS?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is the optimum hardware configuration to run Apache Hadoop?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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Q: What is the difference between NameNode, Backup Node and Checkpoint NameNode in HDFS?

asked Jan 11, 2020 in Big Data | Hadoop by rajeshsharma

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