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

Big Data Interview Questions

Questions Answers Views Company eMail

Why HDFS stores data using commodity hardware despite the higher chance of failures?

What are file permissions in HDFS and how HDFS check permissions for files or directory?

How data or file is written into HDFS?

What is throughput? How does HDFS get a good throughput?

What is the benifit of Distributed cache, why can we just have the file in HDFS and have the application read it?

List the various HDFS daemons in HDFS cluster?

What is the difference between NAS and HDFS?

If data is present in HDFS and RF is defined, then how can we change Replication Factor?

What do you mean by metadata in HDFS? Where is it stored in Hadoop?

What is the optimal block size in HDFS?

What do you mean by metadata in HDFS?

Data node block size in HDFS, why 64MB?

What happens if the block in HDFS is corrupted?

What is Fault Tolerance in HDFS?

What is the procedure to create users in HDFS and how to allocate Quota to them?

Un-Answered Questions { Big Data }

What are the differences between PIG and MapReduce?

594

Explain process to access sub directories recursively in hive queries.

900

What is rack-aware replica placement policy?

1031

How to drop database in apache tajo?

What are the difference between of the “HDFS Block” and “Input Split”?

What are the differences between a node, a cluster, and datacenter in Cassandra?

Explain the concept of cassandra data model?

114

Is there an update statement?

162

Tell the purpose of Bloom Filter in Cassandra?

213

What is setappname spark?

322

What is Interceptor?

109

Illustrate a simple example of the working of MapReduce.

632

How to optimize Hadoop MapReduce Job?

641

What exactly is spark?

272

What do you mean by the high availability of a namenode?

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