Hadoop Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Hadoop Interview Questions

Questions Answers Views Company eMail

Who divides the file into Block while storing inside hdfs in hadoop?

What are file permissions in HDFS? how does HDFS check permissions for files/directory?

How one can change Replication factor when Data is already stored in HDFS

Explain HDFS “Write once Read many” pattern?

Why is block size set to 128 MB in HDFS?

What should be the HDFS Block size to get maximum performance from Hadoop cluster?

What is the importance of dfs.namenode.name.dir in HDFS?

How one can format Hadoop HDFS?

Explain what happens if, during the PUT operation, HDFS block is assigned a replication factor 1 instead of the default value 3?

How to format the HDFS? How frequently it will be done?

Which one is the master node in HDFS? Can it be commodity hardware?

What happens if the block on Hadoop HDFS is corrupted?

What is a block in HDFS, why block size 64MB?

How NameNode tackle Datanode failures in HDFS?

How is indexing done in Hadoop HDFS?

Un-Answered Questions { Hadoop }

What is a parquet file?

304

What do you know about sequencefileinputformat?

670

What does secondary name-node means?

481

What are the parameters of mappers and reducers?

531

What are “Seed Nodes” in Cassandra?

300

How does hdfs get a good throughput?

According to IBM, what are the three characteristics of Big Data?

475

How do I know how many impala nodes are in my cluster?

160

Who uses Cassandra?

How rdd can be created in spark?

275

Where is rdd stored?

327

What is the Repository?

How is the distance between two nodes defined in Hadoop?

1500

What does the “USE” command in the hive do?

744

How do you categorize a big data?

829

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